Updating last green commit failing

https://buildkite.com/bazel/rules-apple-darwin/builds/5214#f932d707-3282-4e7e-8b7e-a66d89a3447c

Start with the linked Buildkite build 5214 and identify the failing step related to updating the last green commit. The issue names no repository file, test, or entry point, so trace the failure through the CI configuration before estimating the change. Done means the last-green-commit update succeeds and the affected CI check passes.

Written by the indexing model from the issue text.