Update OpenROAD submodule

[github-actions]

Automated action to update tools/OpenROAD submodule and tighten CI rule checking.
[ci:rules-tighten]

[vvbandeira]

@maliberty
FYI, issue has been fixed.

[maliberty]

@vvbandeira there is now no tightening - is that expected?

[vvbandeira]

@vvbandeira there is now no tightening - is that expected?

You just missed it. The workflow goes like this:

1. The action triggers around 8 am UTC, i.e., midnight PST.
2. If there is a newer version of OR than what is committed to this repo, continue
3. Update the OR submodule
4. Force push the update to the branch update-openroad --> Keep only one commit per PR
5. The force push also removes the old PR description --> Avoid getting polluted by many updates
6. Add the label UpdateRules
7. CI will start
8. When CI finishes, the action UpdateRules starts
9. If there are rules to be tightened, the bot will commit them and update the PR description
10. The bot will push the changes, triggering a new CI for sanity check

In summary, every day between Step 5 (~00:05 AM PST) and Step 9 (~2:40 AM PST), the PR description is expected to be empty. Step 10 is expected to finish by 6 am PST daily. We can change the trigger time if you prefer to review the PR at the end of the day instead of the beginning of the day.

You can see in the PR description history when it was updated: