chore(deps): update renovate/renovate docker digest to 3bb920c (#52)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| renovate/renovate | container | digest | `6a4948c` -> `3bb920c` |

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### Configuration

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

🚦 **Automerge**: Enabled.

♻ **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:eyJjcmVhdGVkSW5WZXIiOiIzOC4xMjkuMiIsInVwZGF0ZWRJblZlciI6IjM4LjEyOS4yIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbXX0=-->

Reviewed-on: #52
Co-authored-by: Johnny5 <bot@snaile.de>
Co-committed-by: Johnny5 <bot@snaile.de>

.forgejo/workflows/renovate.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   renovate:
     runs-on: docker
-    container: renovate/renovate@sha256:6a4948c97e846bf1082f3956debde5a183917f7b608ccb1ff7971a9423a38a92
+    container: renovate/renovate@sha256:3bb920c6ede5f504be5cbedef634b22ada34e816b4015c8cc548e61189137fde
     env:
       LOG_LEVEL: debug
       RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}