update-changelog doesn't work for emergency release without GitLab milestone
During the release of Tails 5.15.1 I noticed that ./bin/update-changelog
did not do what I wanted, because there was actually no 5.15.1 milestone on GitLab. I think this is not surprising: creating a milestone on Gitlab requires involving sysadmins and gives little advantage.
I'm in a hurry so I haven't investigated this very much, sorry