Ci broken mercurial versions
Based on https://dev.heptapod.net/mercurial/format-source/merge_requests/1, add CI jobs for currently broken Mercurial versions
This instance will be upgraded to Heptapod 1.3.1 (GitLab 16.9.3) on 2023-03-28 at 17:00 UTC+1
Based on https://dev.heptapod.net/mercurial/format-source/merge_requests/1, add CI jobs for currently broken Mercurial versions