chore(deps): update postgres-cluster docker tag to v7.9.1 (#4639)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [postgres-cluster](https://github.com/cloudnative-pg/cloudnative-pg) | minor | `7.8.0` → `7.9.1` |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **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.

---

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

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My41OS4yIiwidXBkYXRlZEluVmVyIjoiNDMuNTkuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiY2hhcnQiLCJpbWFnZSJdfQ==-->

Reviewed-on: #4639
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/komodo/Chart.lock

@@ -4,6 +4,6 @@ dependencies:
   version: 4.6.2
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 7.8.0
-digest: sha256:dd1ccfe8d0bfc7248141d2f72806c6437572f21d818941e9071f58d1a0a47259
-generated: "2026-02-27T18:17:12.586352018Z"
+  version: 7.9.1
+digest: sha256:833a88f82c14f78d63abea99244f2473bee2f5124a533a898a34844956f62b27
+generated: "2026-03-11T22:58:51.287064579Z"

clusters/cl01tl/helm/komodo/Chart.yaml

@@ -23,7 +23,7 @@ dependencies:
     version: 4.6.2
   - name: postgres-cluster
     alias: postgresql-17-fdb-cluster
-    version: 7.8.0
+    version: 7.9.1
     repository: oci://harbor.alexlebens.net/helm-charts
 icon: https://cdn.jsdelivr.net/gh/selfhst/icons/png/komodo.png
 # renovate: datasource=github-releases depName=moghtech/komodo