Update Helm release grafana-operator to v5.21.1 (#2591)

This PR contains the following updates:

| Package | Update | Change | Pending |
|---|---|---|---|
| [grafana-operator](https://github.com/grafana/helm-charts) | minor | `v5.20.0` -> `5.21.1` | `5.21.3` (+1) |

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### Release Notes

<details>
<summary>grafana/helm-charts (grafana-operator)</summary>

### [`v5.21.1`](https://github.com/grafana/helm-charts/releases/tag/grafana-operator-5.21.1)

[Compare Source](https://github.com/grafana/helm-charts/compare/grafana-operator-v5.20.0...grafana-operator-5.21.1)

Helm chart for the [grafana-operator](https://github.com/grafana/grafana-operator)

Tag on source: <https://github.com/grafana/grafana-operator/releases/tag/v5.21.1>

</details>

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### 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.

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

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi4zOS4xIiwidXBkYXRlZEluVmVyIjoiNDIuMzkuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiY2hhcnQiXX0=-->

Reviewed-on: #2591
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/grafana-operator/Chart.lock

@@ -1,7 +1,7 @@
 dependencies:
 - name: grafana-operator
   repository: https://grafana.github.io/helm-charts
-  version: v5.20.0
+  version: 5.21.1
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 7.1.3
@@ -11,5 +11,5 @@ dependencies:
 - name: redis-replication
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 0.5.0
-digest: sha256:7efeacd496cb0dc009013164641868c9de71acc3f26dab8c6eee10e0a9f82c06
-generated: "2025-12-17T16:10:04.690538844Z"
+digest: sha256:485cf44121c365717b671a4c9538d7498bd9279f7cceb856dad5a796f9482afe
+generated: "2025-12-18T02:24:32.928254663Z"

clusters/cl01tl/helm/grafana-operator/Chart.yaml

@@ -17,7 +17,7 @@ maintainers:
   - name: alexlebens
 dependencies:
   - name: grafana-operator
-    version: v5.20.0
+    version: 5.21.1
     repository: https://grafana.github.io/helm-charts
   - name: postgres-cluster
     alias: postgres-18-cluster