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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🚦 **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.

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

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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/authentik/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: sha256:2c3f84ecf3c8cabb7aa7e7e8a1b38cced65156c1e1db9b984154f514c33c9f69
-generated: "2025-12-03T06:02:07.501444093Z"
+  version: 6.16.1
+digest: sha256:c3bafb322ca02710c8f325fefef20678957a8c6fd86894e44e5e318997e5cb80
+generated: "2025-12-03T23:59:57.54998859Z"