Update ci.yml

Author: thisisyusub

.github/workflows/ci.yml

@@ -16,10 +16,9 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: "12.x"
-      - name: Install Flutter
       - uses: subosito/[email protected]
         with:
-          channel: stable
+          channel: "stable"
       - run: flutter pub get
       - run: flutter analyze
       - run: flutter test --coverage