chore: bump dart_code_metrics from 5.5.1 to 5.7.2 in /action_app (#174)

Bumps [dart_code_metrics](https://github.com/dart-code-checker/dart-code-metrics) from 5.5.1 to 5.7.2.
- [Release notes](https://github.com/dart-code-checker/dart-code-metrics/releases)
- [Changelog](https://github.com/dart-code-checker/dart-code-metrics/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dart-code-checker/dart-code-metrics/commits)

---
updated-dependencies:
- dependency-name: dart_code_metrics
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]