fix(deps): update forgejo docker tag to v1.21.11-2 (maint/v5) (#581)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [forgejo](https://forgejo.org) ([source](https://codeberg.org/forgejo/forgejo)) | patch | `1.21.11-1` -> `1.21.11-2` |

---

### Release Notes

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

### [`v1.21.11-2`](https://codeberg.org/forgejo/forgejo/blob/HEAD/RELEASE-NOTES.md#12111-2)

[The complete list of new commits included in the Forgejo v1.21.11-2 release can be reviewed here](https://codeberg.org/forgejo/forgejo/compare/v1.21.11-1...v1.21.11-2), or from the command line with:

```shell
$ git clone https://codeberg.org/forgejo/forgejo
$ git -C forgejo log --oneline --no-merges v1.21.11-1..v1.21.11-2
```

This stable release contains a **security fix**.

-   Recommended Action

    We recommend that all Forgejo installations are [upgraded](https://forgejo.org/docs/v1.21/admin/upgrade/) to the latest version as soon as possible.

-   [Forgejo Semantic Version](https://forgejo.org/docs/v1.21/user/semver/)

    The semantic version was updated to `6.0.13+0-gitea-1.21.10`

-   Security fix
    -   [PR](https://codeberg.org/forgejo/forgejo/pulls/4047). Fixed: the OAuth2 implementation does not always require authentication for public clients, a requirement of [RFC 6749 Section 10.2](https://datatracker.ietf.org/doc/html/rfc6749#section-10.2). A malicious client can impersonate another client and obtain access to protected resources if the impersonated client fails to, or is unable to, keep its client credentials confidential.

</details>

---

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Reviewed-on: https://code.forgejo.org/forgejo-helm/forgejo-helm/pulls/581
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: 1.21.11-1
+appVersion: 1.21.11-2
 icon: https://code.forgejo.org/forgejo/forgejo/raw/branch/forgejo/assets/logo.svg
 home: https://forgejo.org/