Acknowledge reaching upstream GitLab 16.5 branching point
If we were not lagging behind, we would simply start a release branch from there. However, we'll need to climb up to 16.6 in order to land a release that will be on an upstream supported version for enough time.
Still, we'll need to do some housekeeping, and notably set a tag before the upstream merge process resumes, whence this issue with the blocking label.