fix dart format workflow install deps step

needs to use flutter pub get not dart pub get

.github/workflows/dart.yml

@@ -5,17 +5,19 @@ on:
   push:
 
 jobs:
-  analyze:
+  format:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Dart
-        uses: dart-lang/setup-dart@v1
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
 
-      - name: Install Pub Dependencies
-        run: dart pub get
+      - name: Install dependencies
+        run: flutter pub get
 
       - name: Verify Formatting
         run: dart format --output=none --set-exit-if-changed .