Updated java version in actions

Author: Rijuth Menon

.github/workflows/flutter.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/setup-java@v1
         with:
 
-          java-version: "17.x"
+          java-version: "19.x"
 
       - name: Setup Flutter
         uses: subosito/flutter-action@v2