fix: Update upload-artifact action from v3 to v4

- Fixes deprecation warning for actions/upload-artifact@v3
- Updates to the current supported version @v4
- Maintains same functionality for test results artifact upload

Author: mickael-palma-wttj

.github/workflows/smart_tests.yml

@@ -64,7 +64,7 @@ jobs:
           fi
 
       - name: 📊 Upload Test Results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: smart-test-results