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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### Configuration

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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/sonarr-4k/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:ac50ec7248debdffce8b12291db854979b7822b1254c1ad6c995436f4ade0427
-generated: "2025-11-30T21:07:51.092459-06:00"
+  version: 6.16.1
+digest: sha256:bbecefd5c20585a9fcde532663e06698a4a8057066de9483b0b2de50f210037f
+generated: "2025-12-04T00:05:35.118162699Z"