Release tools bot complains when using a stable branch too early for a security MR
https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/1090#note_451644198 says:
The merge request is targeting an old stable branch
This merge request should target any of the following stable branches: 13-5-stable-ee, 13-4-stable-ee, 13-3-stable-ee
This isn't true; it's just early for the 13.6 security release as the branch for that has been cut. gitlab-org/release-tools!1297 (merged) improves the wording to say that the branch isn't 'old', but even better would be if we could handle this case gracefully, with either a more specific message or simply no message at all.