update flutter version in workflow

Author: FredDominant

.github/workflows/change-review.yml

@@ -17,10 +17,10 @@ jobs:
       - name: set up flutter environment
         uses: subosito/flutter-action@v2
         with:
-          flutter-version: '2.5.3'
+          flutter-version: '3.0.0'
 
-#      - name: Install dependencies
-#        run: flutter pub get
+      - name: Install dependencies
+        run: flutter pub get
 
       - name: Run unit tests
         run: flutter test --coverage