Update Helm release rabbitmq to v11.15.4

This MR contains the following updates:

Package	Update	Change
rabbitmq (source)	patch	11.15.3 -> 11.15.4

---

Configuration

Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

Automerge: Enabled.

Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.