Update postgres-cluster Docker tag to v6.16.1 (#2237)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [postgres-cluster](https://github.com/cloudnative-pg/cloudnative-pg) | patch | `6.16.0` -> `6.16.1` |

---

### Configuration

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

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi41LjAiLCJ1cGRhdGVkSW5WZXIiOiI0Mi41LjAiLCJ0YXJnZXRCcmFuY2giOiJtYWluIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsImltYWdlIl19-->

Reviewed-on: #2237
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/outline/Chart.lock

@@ -7,6 +7,6 @@ dependencies:
   version: 1.23.1
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 6.16.0
-digest: sha256:9a3686aeb22ca819c23999a5e2db0bafcd417c9c6ba476d7fc176796e410f976
-generated: "2025-12-03T06:04:14.816169736Z"
+  version: 6.16.1
+digest: sha256:fdf82a6c450624d70404817e92d96626b87ee5c011215ca3c15338c6c3d9b181
+generated: "2025-12-04T00:03:31.441035529Z"

clusters/cl01tl/helm/outline/Chart.yaml

@@ -28,7 +28,7 @@ dependencies:
     version: 1.23.1
   - name: postgres-cluster
     alias: postgres-17-cluster
-    version: 6.16.0
+    version: 6.16.1
     repository: oci://harbor.alexlebens.net/helm-charts
 icon: https://cdn.jsdelivr.net/gh/selfhst/icons/png/outline.png
 appVersion: 0.84.0