update action flutter v

Author: sahandseifi

.github/workflows/pull_request.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v2
         with:
-          flutter-version: "3.19.0"
+          flutter-version: "3.32.0"
           channel: "stable"
           cache: true