chore(deps): update postgres-cluster docker tag to v7.6.0 (#3958)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [postgres-cluster](https://github.com/cloudnative-pg/cloudnative-pg) | minor | `7.5.1` → `7.6.0` |

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Reviewed-on: #3958
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

@@ -4,9 +4,9 @@ dependencies:
   version: 4.6.2
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 7.5.1
+  version: 7.6.0
 - name: volsync-target
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 0.7.0
-digest: sha256:80be16d4ab1d7535539b4fcb08c085b14d7281b8dade0dc02dd4e045e1f72290
-generated: "2026-02-07T02:34:01.787712218Z"
+digest: sha256:7137477df5c68cbe4d1cf28eb1756705b0da404265a25a2f2a426a0feb81749e
+generated: "2026-02-13T19:44:26.232725193Z"