Land your CL changing packages/* first.
Create & land another CL bumping version number (example). It's important to keep it separate CL such that it is never reverted.
Watch gsubtreed-ed repo populated with your change and version bump:
Find the hash of corresponding version bumping commit. (e.g.,
0655bac8c4634b473040cfd80edd9e43f0997499). NOTE: this hash will almost certainly be different than the hash of the commit you landed in
Now that you know (version, hash) tuple, bump the pin in
bootstrap/deps.pyl by following rolling-the-version-of-wheel. It sometimes doesn't work from the first try, but at least CQ dry run can test it for you. (example CL)
And if you import infra_libs in infra_internal repo, you'll also need to roll infra to infra_internal (example), yes, manually :(