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/freshrss/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:f6a701b51fe03506e02c754e02549982d5d8d27d558d8ec329c86b4f5ae24142
-generated: "2025-12-03T06:02:59.168313662Z"
+  version: 6.16.1
+digest: sha256:e4d7c431d7c88cf31d53d611b4fe901fb68c11a2666e48d38ac40feb45b904b5
+generated: "2025-12-04T00:00:29.398819751Z"