chore: use gapic generator python 1.4.1 (#225)

- [ ] 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-os-login/tests/unit/gapic/oslogin_v1/test_os_login_service.py

@@ -27,7 +27,7 @@
 import math
 import pytest
 from proto.marshal.rules.dates import DurationRule, TimestampRule
-
+from proto.marshal.rules import wrappers
 
 from google.api_core import client_options
 from google.api_core import exceptions as core_exceptions