Fix deprecated actions/upload-artifact version

Author: arman29-dev

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
         run: flutter build apk --release
 
       - name: Upload Android APK
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: android-release-apk
           path: build/app/outputs/flutter-apk/app-release.apk