chore(deps): update ghcr.io/renovatebot/renovate:latest docker digest to 5b6a921

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| ghcr.io/renovatebot/renovate | container | digest | `68a8c53` -> `bea731d` |

---

### Configuration

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

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

♻ **Rebasing**: Whenever PR becomes conflicted, 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:eyJjcmVhdGVkSW5WZXIiOiI0MS41MS4xIiwidXBkYXRlZEluVmVyIjoiNDEuNTEuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Reviewed-on: #35
Co-authored-by: Renovate Bot <renovatebot@schulze.network>
Co-committed-by: Renovate Bot <renovatebot@schulze.network>

.gitea/workflows/renovate.yaml

@@ -10,7 +10,7 @@ on:
 jobs:
   renovate:
     runs-on: ubuntu-latest
-    container: ghcr.io/renovatebot/renovate:latest@sha256:68a8c53650ee8c41a24c3624117395c9978912ee0c93a4501a5787b66d4ca3fe
+    container: ghcr.io/renovatebot/renovate:latest@sha256:5b6a921771bfc42cc7caf175708a17236097e8ea1512753fcbaca92af10310ab
     steps:
       - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
       - run: renovate