resource/gitlab_project: Only execute custom `default_branch` logic for GitLab < 14.10
requested to merge github/fork/timofurrer/feature/do-not-execute-default-branch-handling-for-new-releases into main
GitLab 14.10 released with a bugfix for the default_branch field in
the Projects REST API so that our custom logic is no longer required.
see gitlab#333426
Once GitLab 15.1 is out I suggest to remove that code entirely.