Bump the pypi-updates group with 3 updates

Bumps the pypi-updates group with 3 updates: [google-auth](https://github.com/googleapis/google-auth-library-python), [google-api-python-client](https://github.com/googleapis/google-api-python-client) and [types-python-dateutil](https://github.com/typeshed-internal/stub_uploader).


Updates `google-auth` from 2.41.1 to 2.42.1
- [Release notes](https://github.com/googleapis/google-auth-library-python/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-auth-library-python/compare/v2.41.1...v2.42.1)

Updates `google-api-python-client` from 2.183.0 to 2.186.0
- [Release notes](https://github.com/googleapis/google-api-python-client/releases)
- [Commits](https://github.com/googleapis/google-api-python-client/compare/v2.183.0...v2.186.0)

Updates `types-python-dateutil` from 2.9.0.20250822 to 2.9.0.20251008
- [Commits](https://github.com/typeshed-internal/stub_uploader/commits)

---
updated-dependencies:
- dependency-name: google-auth
  dependency-version: 2.42.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pypi-updates
- dependency-name: google-api-python-client
  dependency-version: 2.186.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pypi-updates
- dependency-name: types-python-dateutil
  dependency-version: 2.9.0.20251008
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: pypi-updates
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -18,8 +18,8 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.11"
-google-auth = "2.41.1"
-google-api-python-client = "2.183.0"
+google-auth = "2.42.1"
+google-api-python-client = "2.186.0"
 icalendar = "6.3.1"
 pytz = "2025.2"
 PyYAML = "6.0.3"