GitHub Actions: Use RabbitMQ 4.0.9 for mixed-version testing (backport #13779)

[mergify]

Why

We used a 4.0.x snapshot so far because we needed RabbitMQ 4.0.x to use khepri_mnesia_migration 0.7.2.

RabbitMQ 4.0.9 was released with this update of khepri_mnesia_migration, thus we don't need the snapshot anymore.

---

This is an automatic backport of pull request #13779 done by Mergify.

[mergify]

Cherry-pick of ac90d13 has failed:

On branch mergify/bp/v4.1.x/pr-13779
Your branch is up to date with 'origin/v4.1.x'.

You are currently cherry-picking commit ac90d13af.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/test-make-target.yaml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally