Update Helm release postgresql to v11.9.0

This MR contains the following updates:

Package	Update	Change
postgresql (source)	minor	11.8.1 -> 11.9.0

⚠ Release Notes retrieval for this MR were skipped because no github.com credentials were available. If you are self-hosted, please see this instruction.

---

Configuration

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

🚦 Automerge: Disabled due to failing status checks.

♻ 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, click this checkbox.

---

This MR has been generated by Renovate Bot.