This change ensures that the the script can handle
commits with no committer in them. This will happen
for some commits that are auto-generated during
PRs.
This commit ensures that the changelog is updated before a release with
the correct date and version.
Also, after a release, a mergeback PR is created to ensure that the
changelog update and version bump is available in main.
Fix a minor issue in the update-release-branch.py script that performs a
call to `sorted` but doesn't use the output. Since `sorted` does not
operate in place, the call is currently useless. As a result, the function
`get_pr_for_commit` does not currently work as exected. I.e. it is
expected to return the "first" (i.e. lowest PR number), but actually it
returns the first in the list provided by GitHub.
