chore(deps): bump flutter_gen from 5.2.0 to 5.3.0

Bumps [flutter_gen](https://github.com/FlutterGen/flutter_gen) from 5.2.0 to 5.3.0.
- [Release notes](https://github.com/FlutterGen/flutter_gen/releases)
- [Changelog](https://github.com/FlutterGen/flutter_gen/blob/main/CHANGELOG.md)
- [Commits](FlutterGen/flutter_gen@v5.2.0...v5.3.0)

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

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