👾 fix: Update workflow version from deprecated one

Changelog: fix

Author: rnbsovstudy

.github/workflows/flutter-build.yml

@@ -37,7 +37,7 @@ jobs:
         run: flutter build apk --release
 
       - name: Upload APK
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: release-apk
           path: build/app/outputs/flutter-apk/app-release.apk