Use flutter instead of dart for format CI (#24)

Author: pkongkha

.github/workflows/quality.yml

@@ -21,8 +21,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Setup dart
-        uses: dart-lang/setup-dart@v1
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+          flutter-version-file: pubspec.yaml
       - name: Format code
         run: dart format --output=none --set-exit-if-changed .
   matrics: