chore(deps): update docker docker tag to v27 (#20)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker | major | `26.1.4` -> `27.0.2` |

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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 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:eyJjcmVhdGVkSW5WZXIiOiIzNy40MTcuMSIsInVwZGF0ZWRJblZlciI6IjM3LjQxOS4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbXX0=-->

Reviewed-on: #20
Co-authored-by: Renovate Bot <renovate@mgrote.net>
Co-committed-by: Renovate Bot <renovate@mgrote.net>

.woodpecker/build.yml

@@ -33,7 +33,7 @@ steps:
         evaluate: 'CI_COMMIT_AUTHOR_EMAIL != "renovate@mgrote.net"'
 
   build_and_push: # damit dieser Step laufen kann muss das Repo in der Woodpecker-GUI "privilegiert" sein
-    image: "docker:26.1.4"
+    image: "docker:27.0.2"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
     commands: