chore(deps): update dependency google-auth to v2.2.1 (#55)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-auth](https://togithub.com/googleapis/google-auth-library-python) | `==2.2.0` -> `==2.2.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-auth/2.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-auth/2.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-auth/2.2.1/compatibility-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-auth/2.2.1/confidence-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/google-auth-library-python</summary>

### [`v2.2.1`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;221-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev220v221-2021-09-28)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v2.2.0...v2.2.1)

</details>

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samples/snippets/requirements-test.txt

@@ -1,4 +1,4 @@
-google-auth==2.2.0
+google-auth==2.2.1
 google-cloud-pubsub==2.8.0
 protobuf==3.18.0
 pytest==6.2.5