Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 1 to 2.3.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](https://github.com/subosito/flutter-action/compare/v1...v2.3.0)

---
updated-dependencies:
- dependency-name: subosito/flutter-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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