chore(deps): pin registry.mgrote.net/allzweckcontainer docker tag to 6cc0c5a (#693)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| registry.mgrote.net/allzweckcontainer | pinDigest |  -> `6cc0c5a` |

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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 becomes conflicted, 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:eyJjcmVhdGVkSW5WZXIiOiIzNy4xNTIuMSIsInVwZGF0ZWRJblZlciI6IjM3LjE1Mi4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIn0=-->

Reviewed-on: #693
Co-authored-by: Renovate Bot <renovate@mgrote.net>
Co-committed-by: Renovate Bot <renovate@mgrote.net>

.woodpecker/lint.yml

@@ -10,7 +10,7 @@ steps:
           - tag
 
   shellcheck:
-    image: registry.mgrote.net/allzweckcontainer
+    image: registry.mgrote.net/allzweckcontainer@sha256:6cc0c5abd063331dd5e205d133ec76097b5d482752fe7ca9b40235ae7712f112
     commands:
       - |
         find . -type f -not -path './.git/*' -not -path './collections/*' -not -path './friedhof/*' -exec file {} \; | while IFS= read -r line; do