upgrade flutter to stable v1.22.4 + packages upgrade

.github/workflows/check.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: subosito/flutter-action@v1
         with:
           channel: stable
-          flutter-version: '1.22.3'
+          flutter-version: '1.22.4'
 
       - name: Clone the repository.
         uses: actions/checkout@v2

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: subosito/flutter-action@v1
         with:
           channel: stable
-          flutter-version: '1.22.3'
+          flutter-version: '1.22.4'
 
       # Workaround for this Android Gradle Plugin issue (supposedly fixed in AGP 4.1):
       # https://issuetracker.google.com/issues/144111441
@@ -50,8 +50,8 @@ jobs:
           echo "${{ secrets.KEY_JKS }}" > release.keystore.asc
           gpg -d --passphrase "${{ secrets.KEY_JKS_PASSPHRASE }}" --batch release.keystore.asc > $AVES_STORE_FILE
           rm release.keystore.asc
-          flutter build apk --bundle-sksl-path shaders_1.22.3.sksl.json
+          flutter build apk --bundle-sksl-path shaders_1.22.4.sksl.json
-          flutter build appbundle --bundle-sksl-path shaders_1.22.3.sksl.json
+          flutter build appbundle --bundle-sksl-path shaders_1.22.4.sksl.json
           rm $AVES_STORE_FILE
         env:
           AVES_STORE_FILE: ${{ github.workspace }}/key.jks