Roll Chromite from 7ee6e840b449 to 73e7b77d6878 (4 revisions)

https://chromium.googlesource.com/chromiumos/chromite.git/+log/7ee6e840b449..73e7b77d6878

2025-05-06 vapier@chromium.org lib: gs_unittest: lower sleep & retry for unmocked tests
2025-05-06 vapier@chromium.org cli: pylint: disallow Except & Exceptions in docstrings
2025-05-06 yupingso@chromium.org contrib: generate_firmware_configs: Download GS files in parallel
2025-05-06 vapier@chromium.org shell: enter_chroot: stop passing user boto creds into the SDK

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/chromite-chromium-autoroll
Please CC chrome-os-gardeners-reviews@google.com,chrome-os-gardeners@google.com,chromeos-velocity@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.chrome.try:chromeos-betty-chrome
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Change-Id: Icc377061a674a91c4616271ed1be0b0886e8fa24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6516435
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Cr-Commit-Position: refs/heads/main@{#1456494}