chore: use gapic generator python 1.4.1 (#275)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 473833416

Source-Link: googleapis/googleapis@565a550

Source-Link: googleapis/googleapis-gen@1ee1a06
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMWVlMWEwNmM2ZGUzY2E4Yjg0MzU3MmMxZmRlMDU0OGY4NDIzNjk4OSJ9

Author: gcf-owl-bot[bot]

packages/google-cloud-datalabeling/tests/unit/gapic/datalabeling_v1beta1/test_data_labeling_service.py

@@ -48,6 +48,7 @@
 from google.rpc import status_pb2  # type: ignore
 import grpc
 from grpc.experimental import aio
+from proto.marshal.rules import wrappers
 from proto.marshal.rules.dates import DurationRule, TimestampRule
 import pytest