deps: update dependency google-auth to v2.12.0 (#867)

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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) | `==2.11.0` -> `==2.12.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-auth/2.12.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-auth/2.12.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-auth/2.12.0/compatibility-slim/2.11.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-auth/2.12.0/confidence-slim/2.11.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.12.0`](https://togithub.com/googleapis/google-auth-library-python/blob/HEAD/CHANGELOG.md#&#8203;2120-httpsgithubcomgoogleapisgoogle-auth-library-pythoncomparev2111v2120-2022-09-26)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v2.11.1...v2.12.0)

##### Features

-   Retry behavior ([#&#8203;1113](https://togithub.com/googleapis/google-auth-library-python/issues/1113)) ([78d3790](https://togithub.com/googleapis/google-auth-library-python/commit/78d37906f0811f9878834ac34d5b83e5cbd58800))

##### Bug Fixes

-   Modify RefreshError exception to use gcloud ADC command. ([#&#8203;1149](https://togithub.com/googleapis/google-auth-library-python/issues/1149)) ([059fd35](https://togithub.com/googleapis/google-auth-library-python/commit/059fd353d5f2a8527de8bf1fe6dbd5e326c0e29a))
-   Revert "Update token refresh threshold from 20 seconds to 5 minutes". ([186464b](https://togithub.com/googleapis/google-auth-library-python/commit/186464bf5920fb3b76499ac542b0fb90023629de))

### [`v2.11.1`](https://togithub.com/googleapis/google-auth-library-python/blob/HEAD/CHANGELOG.md#&#8203;2111-httpsgithubcomgoogleapisgoogle-auth-library-pythoncomparev2110v2111-2022-09-20)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v2.11.0...v2.11.1)

##### Bug Fixes

-   Fix socket leak in impersonated_credentials ([#&#8203;1123](https://togithub.com/googleapis/google-auth-library-python/issues/1123)) ([b1eb467](https://togithub.com/googleapis/google-auth-library-python/commit/b1eb467f50f0c080e89a122426061b28f0be0567)), closes [#&#8203;1122](https://togithub.com/googleapis/google-auth-library-python/issues/1122)
-   Make pluggable auth tests work in all environments ([#&#8203;1114](https://togithub.com/googleapis/google-auth-library-python/issues/1114)) ([bb5c979](https://togithub.com/googleapis/google-auth-library-python/commit/bb5c9791c64e2472a90ba7191f79f4c5fedb2538))
-   Skip oauth2client adapter tests if oauth2client is not installed ([#&#8203;1132](https://togithub.com/googleapis/google-auth-library-python/issues/1132)) ([d15092f](https://togithub.com/googleapis/google-auth-library-python/commit/d15092ff8b66b3039641d482a0debafde4ba0077))
-   Update token refresh threshold from 20 seconds to 5 minutes ([#&#8203;1146](https://togithub.com/googleapis/google-auth-library-python/issues/1146)) ([261a561](https://togithub.com/googleapis/google-auth-library-python/commit/261a56138fba33ff7d898ab5907a6098125fefef))

##### Documentation

-   **samples:** Add auth samples and tests ([#&#8203;1102](https://togithub.com/googleapis/google-auth-library-python/issues/1102)) ([ac87520](https://togithub.com/googleapis/google-auth-library-python/commit/ac875201bc8ba5d638a9eafcd3ccfdeb73a2f0ec))

</details>

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