Remove executable bit in tools/third_party/h2/ (#12591)

This appears to be an accident. The only two files with the executable
bit in https://github.com/python-hyper/hyper-h2 are:
examples/tornado/tornado-server.py
utils/backport.sh

This was true also at the v3.0.1 tag. (version in HISTORY.rst)

The two mentioned files are left alone.
diff --git a/tools/third_party/h2/.coveragerc b/tools/third_party/h2/.coveragerc
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diff --git a/tools/third_party/h2/.gitignore b/tools/third_party/h2/.gitignore
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diff --git a/tools/third_party/h2/.travis.yml b/tools/third_party/h2/.travis.yml
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diff --git a/tools/third_party/h2/CONTRIBUTORS.rst b/tools/third_party/h2/CONTRIBUTORS.rst
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diff --git a/tools/third_party/h2/HISTORY.rst b/tools/third_party/h2/HISTORY.rst
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diff --git a/tools/third_party/h2/LICENSE b/tools/third_party/h2/LICENSE
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diff --git a/tools/third_party/h2/MANIFEST.in b/tools/third_party/h2/MANIFEST.in
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diff --git a/tools/third_party/h2/Makefile b/tools/third_party/h2/Makefile
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diff --git a/tools/third_party/h2/README.rst b/tools/third_party/h2/README.rst
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diff --git a/tools/third_party/h2/docs/Makefile b/tools/third_party/h2/docs/Makefile
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diff --git a/tools/third_party/h2/docs/make.bat b/tools/third_party/h2/docs/make.bat
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diff --git a/tools/third_party/h2/docs/source/_static/.keep b/tools/third_party/h2/docs/source/_static/.keep
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diff --git a/tools/third_party/h2/docs/source/_static/h2.connection.H2ConnectionStateMachine.dot.png b/tools/third_party/h2/docs/source/_static/h2.connection.H2ConnectionStateMachine.dot.png
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diff --git a/tools/third_party/h2/docs/source/_static/h2.stream.H2StreamStateMachine.dot.png b/tools/third_party/h2/docs/source/_static/h2.stream.H2StreamStateMachine.dot.png
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diff --git a/tools/third_party/h2/docs/source/advanced-usage.rst b/tools/third_party/h2/docs/source/advanced-usage.rst
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diff --git a/tools/third_party/h2/docs/source/api.rst b/tools/third_party/h2/docs/source/api.rst
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diff --git a/tools/third_party/h2/docs/source/asyncio-example.rst b/tools/third_party/h2/docs/source/asyncio-example.rst
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diff --git a/tools/third_party/h2/docs/source/basic-usage.rst b/tools/third_party/h2/docs/source/basic-usage.rst
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diff --git a/tools/third_party/h2/docs/source/conf.py b/tools/third_party/h2/docs/source/conf.py
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diff --git a/tools/third_party/h2/docs/source/contributors.rst b/tools/third_party/h2/docs/source/contributors.rst
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diff --git a/tools/third_party/h2/docs/source/curio-example.rst b/tools/third_party/h2/docs/source/curio-example.rst
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diff --git a/tools/third_party/h2/docs/source/eventlet-example.rst b/tools/third_party/h2/docs/source/eventlet-example.rst
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diff --git a/tools/third_party/h2/docs/source/examples.rst b/tools/third_party/h2/docs/source/examples.rst
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diff --git a/tools/third_party/h2/docs/source/index.rst b/tools/third_party/h2/docs/source/index.rst
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diff --git a/tools/third_party/h2/docs/source/installation.rst b/tools/third_party/h2/docs/source/installation.rst
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diff --git a/tools/third_party/h2/docs/source/low-level.rst b/tools/third_party/h2/docs/source/low-level.rst
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diff --git a/tools/third_party/h2/docs/source/negotiating-http2.rst b/tools/third_party/h2/docs/source/negotiating-http2.rst
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diff --git a/tools/third_party/h2/docs/source/release-notes.rst b/tools/third_party/h2/docs/source/release-notes.rst
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diff --git a/tools/third_party/h2/docs/source/release-process.rst b/tools/third_party/h2/docs/source/release-process.rst
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diff --git a/tools/third_party/h2/docs/source/testimonials.rst b/tools/third_party/h2/docs/source/testimonials.rst
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diff --git a/tools/third_party/h2/docs/source/tornado-example.rst b/tools/third_party/h2/docs/source/tornado-example.rst
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diff --git a/tools/third_party/h2/docs/source/twisted-example.rst b/tools/third_party/h2/docs/source/twisted-example.rst
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diff --git a/tools/third_party/h2/docs/source/twisted-head-example.rst b/tools/third_party/h2/docs/source/twisted-head-example.rst
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diff --git a/tools/third_party/h2/docs/source/twisted-post-example.rst b/tools/third_party/h2/docs/source/twisted-post-example.rst
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diff --git a/tools/third_party/h2/docs/source/wsgi-example.rst b/tools/third_party/h2/docs/source/wsgi-example.rst
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diff --git a/tools/third_party/h2/examples/asyncio/asyncio-server.py b/tools/third_party/h2/examples/asyncio/asyncio-server.py
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diff --git a/tools/third_party/h2/examples/asyncio/cert.crt b/tools/third_party/h2/examples/asyncio/cert.crt
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diff --git a/tools/third_party/h2/examples/asyncio/cert.key b/tools/third_party/h2/examples/asyncio/cert.key
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diff --git a/tools/third_party/h2/examples/asyncio/wsgi-server.py b/tools/third_party/h2/examples/asyncio/wsgi-server.py
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diff --git a/tools/third_party/h2/examples/curio/curio-server.py b/tools/third_party/h2/examples/curio/curio-server.py
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diff --git a/tools/third_party/h2/examples/curio/localhost.crt.pem b/tools/third_party/h2/examples/curio/localhost.crt.pem
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diff --git a/tools/third_party/h2/examples/curio/localhost.key b/tools/third_party/h2/examples/curio/localhost.key
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diff --git a/tools/third_party/h2/examples/eventlet/eventlet-server.py b/tools/third_party/h2/examples/eventlet/eventlet-server.py
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diff --git a/tools/third_party/h2/examples/eventlet/server.crt b/tools/third_party/h2/examples/eventlet/server.crt
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diff --git a/tools/third_party/h2/examples/eventlet/server.key b/tools/third_party/h2/examples/eventlet/server.key
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diff --git a/tools/third_party/h2/examples/fragments/client_https_setup_fragment.py b/tools/third_party/h2/examples/fragments/client_https_setup_fragment.py
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diff --git a/tools/third_party/h2/examples/fragments/client_upgrade_fragment.py b/tools/third_party/h2/examples/fragments/client_upgrade_fragment.py
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diff --git a/tools/third_party/h2/examples/fragments/server_https_setup_fragment.py b/tools/third_party/h2/examples/fragments/server_https_setup_fragment.py
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diff --git a/tools/third_party/h2/examples/fragments/server_upgrade_fragment.py b/tools/third_party/h2/examples/fragments/server_upgrade_fragment.py
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diff --git a/tools/third_party/h2/examples/tornado/server.crt b/tools/third_party/h2/examples/tornado/server.crt
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diff --git a/tools/third_party/h2/examples/tornado/server.key b/tools/third_party/h2/examples/tornado/server.key
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diff --git a/tools/third_party/h2/examples/twisted/head_request.py b/tools/third_party/h2/examples/twisted/head_request.py
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diff --git a/tools/third_party/h2/examples/twisted/post_request.py b/tools/third_party/h2/examples/twisted/post_request.py
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diff --git a/tools/third_party/h2/examples/twisted/server.crt b/tools/third_party/h2/examples/twisted/server.crt
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diff --git a/tools/third_party/h2/examples/twisted/server.csr b/tools/third_party/h2/examples/twisted/server.csr
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diff --git a/tools/third_party/h2/examples/twisted/server.key b/tools/third_party/h2/examples/twisted/server.key
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diff --git a/tools/third_party/h2/examples/twisted/twisted-server.py b/tools/third_party/h2/examples/twisted/twisted-server.py
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diff --git a/tools/third_party/h2/h2/__init__.py b/tools/third_party/h2/h2/__init__.py
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diff --git a/tools/third_party/h2/h2/config.py b/tools/third_party/h2/h2/config.py
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diff --git a/tools/third_party/h2/h2/connection.py b/tools/third_party/h2/h2/connection.py
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diff --git a/tools/third_party/h2/h2/errors.py b/tools/third_party/h2/h2/errors.py
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diff --git a/tools/third_party/h2/h2/events.py b/tools/third_party/h2/h2/events.py
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diff --git a/tools/third_party/h2/h2/exceptions.py b/tools/third_party/h2/h2/exceptions.py
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diff --git a/tools/third_party/h2/h2/frame_buffer.py b/tools/third_party/h2/h2/frame_buffer.py
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diff --git a/tools/third_party/h2/h2/settings.py b/tools/third_party/h2/h2/settings.py
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diff --git a/tools/third_party/h2/h2/stream.py b/tools/third_party/h2/h2/stream.py
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diff --git a/tools/third_party/h2/h2/utilities.py b/tools/third_party/h2/h2/utilities.py
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diff --git a/tools/third_party/h2/h2/windows.py b/tools/third_party/h2/h2/windows.py
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diff --git a/tools/third_party/h2/setup.cfg b/tools/third_party/h2/setup.cfg
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diff --git a/tools/third_party/h2/setup.py b/tools/third_party/h2/setup.py
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diff --git a/tools/third_party/h2/test/conftest.py b/tools/third_party/h2/test/conftest.py
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diff --git a/tools/third_party/h2/test/coroutine_tests.py b/tools/third_party/h2/test/coroutine_tests.py
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diff --git a/tools/third_party/h2/test/helpers.py b/tools/third_party/h2/test/helpers.py
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diff --git a/tools/third_party/h2/test/test_basic_logic.py b/tools/third_party/h2/test/test_basic_logic.py
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diff --git a/tools/third_party/h2/test/test_closed_streams.py b/tools/third_party/h2/test/test_closed_streams.py
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diff --git a/tools/third_party/h2/test/test_complex_logic.py b/tools/third_party/h2/test/test_complex_logic.py
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diff --git a/tools/third_party/h2/test/test_config.py b/tools/third_party/h2/test/test_config.py
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diff --git a/tools/third_party/h2/test/test_events.py b/tools/third_party/h2/test/test_events.py
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diff --git a/tools/third_party/h2/test/test_exceptions.py b/tools/third_party/h2/test/test_exceptions.py
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diff --git a/tools/third_party/h2/test/test_flow_control_window.py b/tools/third_party/h2/test/test_flow_control_window.py
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diff --git a/tools/third_party/h2/test/test_h2_upgrade.py b/tools/third_party/h2/test/test_h2_upgrade.py
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diff --git a/tools/third_party/h2/test/test_head_request.py b/tools/third_party/h2/test/test_head_request.py
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diff --git a/tools/third_party/h2/test/test_header_indexing.py b/tools/third_party/h2/test/test_header_indexing.py
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diff --git a/tools/third_party/h2/test/test_informational_responses.py b/tools/third_party/h2/test/test_informational_responses.py
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diff --git a/tools/third_party/h2/test/test_interacting_stacks.py b/tools/third_party/h2/test/test_interacting_stacks.py
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diff --git a/tools/third_party/h2/test/test_invalid_content_lengths.py b/tools/third_party/h2/test/test_invalid_content_lengths.py
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diff --git a/tools/third_party/h2/test/test_invalid_frame_sequences.py b/tools/third_party/h2/test/test_invalid_frame_sequences.py
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diff --git a/tools/third_party/h2/test/test_invalid_headers.py b/tools/third_party/h2/test/test_invalid_headers.py
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diff --git a/tools/third_party/h2/test/test_priority.py b/tools/third_party/h2/test/test_priority.py
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diff --git a/tools/third_party/h2/test/test_related_events.py b/tools/third_party/h2/test/test_related_events.py
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diff --git a/tools/third_party/h2/test/test_rfc7838.py b/tools/third_party/h2/test/test_rfc7838.py
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diff --git a/tools/third_party/h2/test/test_settings.py b/tools/third_party/h2/test/test_settings.py
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diff --git a/tools/third_party/h2/test/test_state_machines.py b/tools/third_party/h2/test/test_state_machines.py
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diff --git a/tools/third_party/h2/test/test_stream_reset.py b/tools/third_party/h2/test/test_stream_reset.py
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diff --git a/tools/third_party/h2/test/test_utility_functions.py b/tools/third_party/h2/test/test_utility_functions.py
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diff --git a/tools/third_party/h2/test_requirements.txt b/tools/third_party/h2/test_requirements.txt
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diff --git a/tools/third_party/h2/tox.ini b/tools/third_party/h2/tox.ini
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diff --git a/tools/third_party/h2/visualizer/NOTICES.visualizer b/tools/third_party/h2/visualizer/NOTICES.visualizer
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diff --git a/tools/third_party/h2/visualizer/visualize.py b/tools/third_party/h2/visualizer/visualize.py
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