updating work flow add "setup flutter"

.github/workflows/simple_workflow.yml

@@ -15,7 +15,9 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Setup Dart & Flutter
-        uses: dart-lang/setup-dart@v1
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: "latest" # Specify the Flutter version if needed
 
       - name: Install Dependencies
         run: flutter pub get