github actions

.github/workflows/check.yml

@@ -12,10 +12,10 @@ jobs:
     name: Check code quality.
     runs-on: ubuntu-latest
     steps:
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@v2
         with:
-          channel: stable
           flutter-version: '2.10.4'
+          channel: 'stable'
 
       - name: Clone the repository.
         uses: actions/checkout@v2

.github/workflows/release.yml

@@ -14,10 +14,10 @@ jobs:
         with:
           java-version: '11.x'
 
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@v2
         with:
-          channel: stable
           flutter-version: '2.10.4'
+          channel: 'stable'
 
       # Workaround for this Android Gradle Plugin issue (supposedly fixed in AGP 4.1):
       # https://issuetracker.google.com/issues/144111441