build_plan_generator: allow text_pb inputs and outputs

this should aid Navil with her current work

also this updates the infra/proto dep, since it was out of date, and was
unable to recognize some proto enum values.

BUG=None
TEST=local run

Change-Id: I6ad3d7303ed522abfc453633d9eb0f861cfc1585
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/go/+/2308950
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
Auto-Submit: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Reviewed-by: Navil Perez <navil@google.com>
4 files changed