pw_presubmit: Make keep_sorted check blocking
pw_presubmit: Make keep_sorted check blocking

Bug: b/250875082
Change-Id: Id55769e46b7f8fe506789db00281930be58e6c99
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/112715
Pigweed-Auto-Submit: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Commit-Queue: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed