fix(deps): update forgejo docker tag to v1.21.11-0 (#426)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| forgejo | patch | `1.21.10-0` -> `1.21.11-0` |

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### Release Notes

<details>
<summary>forgejo/forgejo (forgejo)</summary>

### [`v1.21.11-0`](https://codeberg.org/forgejo/forgejo/releases/tag/v1.21.11-0)

See https://codeberg.org/forgejo/forgejo/src/branch/forgejo/RELEASE-NOTES.md#1-21-11-0

</details>

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Reviewed-on: https://codeberg.org/forgejo-contrib/forgejo-helm/pulls/426
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>

Chart.yaml

@@ -3,7 +3,7 @@ name: forgejo
 description: Forgejo Helm chart for Kubernetes
 type: application
 version: 0.0.0
-appVersion: 1.21.10-0
+appVersion: 1.21.11-0
 icon: https://design.codeberg.org/logo-kit/icon.svg
 home: https://forgejo.org/