update flutter version in cd script

Author: hnvn

.github/workflows/dart.yml

@@ -13,9 +13,9 @@ jobs:
     - uses: actions/setup-java@v1
       with:
         java-version: '12.x'
-    - uses: subosito/flutter-action@v1
+    - uses: subosito/flutter-action@v2
       with:
-        flutter-version: '2.0.x'
+        flutter-version: '3.22.x'
     - run: flutter pub get
     - run: flutter test --coverage
     - uses: codecov/codecov-action@v1.0.7