chore: remove skip from falsy return type tests

Author: Amin Farjadi

tests/functional/event_handler/_pydantic/test_openapi_validation_middleware.py

@@ -1758,7 +1758,6 @@ def handler_none_allowed() -> Optional[Model]:
     assert result["body"] == "null"
 
 
-@pytest.mark.skipif(reason="Test temporarily disabled until falsy return is fixed")
 @pytest.mark.parametrize(
     "path, body",
     [
@@ -1814,7 +1813,6 @@ def handler_valid_response() -> Model:
     assert body == {"name": "Joe", "age": 18}
 
 
-@pytest.mark.skipif(reason="Test temporarily disabled until falsy return is fixed")
 @pytest.mark.parametrize(
     "http_code",
     (422, 500, 510),