Bump flutter-actions/setup-flutter in the github-actions group (#146)

Bumps the github-actions group with 1 update: [flutter-actions/setup-flutter](https://github.com/flutter-actions/setup-flutter).


Updates `flutter-actions/setup-flutter` from d030cb603380106494f72d65a7e52462f380781f to 54feb1e258158303e041b9eaf89314dcfbf6d38a
- [Release notes](https://github.com/flutter-actions/setup-flutter/releases)
- [Commits](flutter-actions/setup-flutter@d030cb6...54feb1e)

---
updated-dependencies:
- dependency-name: flutter-actions/setup-flutter
  dependency-type: direct:production
  dependency-group: github-actions
...

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

.github/workflows/publish.yml

@@ -38,7 +38,7 @@ jobs:
       #
       # The dart binary from a Flutter SDK facilitates publishing both Flutter
       # and pure-dart packages.
-      - uses: flutter-actions/setup-flutter@d030cb603380106494f72d65a7e52462f380781f
+      - uses: flutter-actions/setup-flutter@54feb1e258158303e041b9eaf89314dcfbf6d38a
       # Minimal package setup and dry run checks.
       - name: Install dependencies
         run: dart pub get