Workaround flaky test setup in Python versions > 3.13.3

Author: Pijukatel

tests/unit/conftest.py

@@ -38,7 +38,8 @@ def prepare_test_env(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> Callabl
     """
 
     def _prepare_test_env() -> None:
-        delattr(apify._actor.Actor, '__wrapped__')
+        if hasattr(apify._actor.Actor, '__wrapped__'):
+            delattr(apify._actor.Actor, '__wrapped__')
         apify._actor._ActorType._is_any_instance_initialized = False
 
         # Set the environment variable for the local storage directory to the temporary path.