chore: use gapic generator python 1.4.1 (#259)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 473833416

Source-Link: googleapis/googleapis@565a550

Source-Link: https://github.com/googleapis/googleapis-gen/commit/1ee1a06c6de3ca8b843572c1fde0548f84236989
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMWVlMWEwNmM2ZGUzY2E4Yjg0MzU3MmMxZmRlMDU0OGY4NDIzNjk4OSJ9

Author: gcf-owl-bot[bot]

tests/unit/gapic/bigquery_connection_v1/test_connection_service.py

@@ -38,6 +38,7 @@
 from google.type import expr_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