Bump dart-code-checker/dart-code-metrics-action from 2 to 4

Bumps [dart-code-checker/dart-code-metrics-action](https://github.com/dart-code-checker/dart-code-metrics-action) from 2 to 4.
- [Release notes](https://github.com/dart-code-checker/dart-code-metrics-action/releases)
- [Changelog](https://github.com/dart-code-checker/dart-code-metrics-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/dart-code-checker/dart-code-metrics-action/compare/v2...v4)

---
updated-dependencies:
- dependency-name: dart-code-checker/dart-code-metrics-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/dartcodemetrics.yaml

@@ -14,7 +14,7 @@ jobs:
           submodules: true
 
       - name: dart-code-metrics
-        uses: dart-code-checker/dart-code-metrics-action@v2
+        uses: dart-code-checker/dart-code-metrics-action@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           relative_path: authpass