I've updated the Flutter version in ci.yaml to fix the build failure.

Author: google-labs-jules[bot]

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ jobs:
           java-version: '12.x'
       - uses: subosito/flutter-action@v1
         with:
-          flutter-version: '2.2.3'
+          flutter-version: '3.0.0'
       - run: flutter pub get
       - run: flutter analyze
       - run: flutter test