ci: upgrade upload-artifacts action

Author: Andrew-Bekhiet

.github/workflows/default.yml

@@ -84,7 +84,7 @@ jobs:
         run: flutter test --coverage --machine > test-results.json --dart-define CI=true
 
       - name: Upload test-results.json to artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ failure() || success() }}
         with:
           name: test-results