Update pr.yml

Author: kmahmood74

.github/workflows/pr.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Setup Flutter SDK
       uses: subosito/flutter-action@v2
       with:
-        channel: 'stable'
+        flutter-version: "3.19.3"
 
     - name: Lint
       run: dart format --output=none --set-exit-if-changed .