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` |

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

clusters/cl01tl/helm/yamtrack/Chart.lock

@@ -4,6 +4,6 @@ dependencies:
   version: 4.4.0
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 6.16.0
-digest: sha256:953c8d8283467cb8406a68598741bc9cdc6dc56980409ee46588a9669a1b9550
-generated: "2025-11-30T21:08:01.158525-06:00"
+  version: 6.16.1
+digest: sha256:974f36a9b9acf1dbe8c6466857d5fc8ca938f35259958e9be5f7248fae5c1517
+generated: "2025-12-04T00:06:31.73820002Z"