Update publisher.yml

Author: shiburagi

.github/workflows/publisher.yml

@@ -18,7 +18,8 @@ jobs:
       - name: Install Flutter
         uses: subosito/flutter-action@v2
         with:
-          flutter-version: '3.22.0'
+          channel: stable # or: beta, master (or main)
+          flutter-version: 3.22.0
       - name: Install dependencies
         run: flutter pub get
       - name: Publish