chore(deps): update dependency google-auth to v1.30.0 (#79)

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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) | `==1.27.0` -> `==1.30.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-auth/1.30.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-auth/1.30.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-auth/1.30.0/compatibility-slim/1.27.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-auth/1.30.0/confidence-slim/1.27.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v1.30.0`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;1300-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev1290v1300-2021-04-23)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v1.29.0...v1.30.0)

##### Features

-   add reauth support to async user credentials for gcloud ([#&#8203;738](https://www.github.com/googleapis/google-auth-library-python/issues/738)) ([9e10823](https://www.github.com/googleapis/google-auth-library-python/commit/9e1082366d113286bc063051fd76b4799791d943)). This internal feature is for gcloud developers only.

### [`v1.29.0`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;1290-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev1281v1290-2021-04-15)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v1.28.1...v1.29.0)

##### Features

-   add reauth feature to user credentials for gcloud ([#&#8203;727](https://www.github.com/googleapis/google-auth-library-python/issues/727)) ([82293fe](https://www.github.com/googleapis/google-auth-library-python/commit/82293fe2caaf5258babb5df1cff0a5ddc9e44b38)). This internal feature is for gcloud developers only.

##### Bug Fixes

-   Allow multiple audiences for id_token.verify_token ([#&#8203;733](https://www.github.com/googleapis/google-auth-library-python/issues/733)) ([56c3946](https://www.github.com/googleapis/google-auth-library-python/commit/56c394680ac6dfc07c611a9eb1e030e32edd4fe1))

##### [1.28.1](https://www.github.com/googleapis/google-auth-library-python/compare/v1.28.0...v1.28.1) (2021-04-08)

##### Bug Fixes

-   support custom alg in jwt header for signing ([#&#8203;729](https://www.github.com/googleapis/google-auth-library-python/issues/729)) ([0a83706](https://www.github.com/googleapis/google-auth-library-python/commit/0a83706c9d65f7d5a30ea3b42c5beac269ed2a25))

### [`v1.28.1`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;1281-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev1280v1281-2021-04-08)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v1.28.0...v1.28.1)

### [`v1.28.0`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;1280-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev1271v1280-2021-03-16)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v1.27.1...v1.28.0)

##### Features

-   allow the AWS_DEFAULT_REGION environment variable ([#&#8203;721](https://www.github.com/googleapis/google-auth-library-python/issues/721)) ([199da47](https://www.github.com/googleapis/google-auth-library-python/commit/199da4781029916dc075738ec7bd173bd89abe54))
-   expose library version at `google.auth.__version` ([#&#8203;683](https://www.github.com/googleapis/google-auth-library-python/issues/683)) ([a2cbc32](https://www.github.com/googleapis/google-auth-library-python/commit/a2cbc3245460e1ae1d310de6a2a4007d5a3a06b7))

##### Bug Fixes

-   fix unit tests so they can work in g3 ([#&#8203;714](https://www.github.com/googleapis/google-auth-library-python/issues/714)) ([d80c85f](https://www.github.com/googleapis/google-auth-library-python/commit/d80c85f285ae1a44ddc5a5d94a66e065a79f6d19))

##### [1.27.1](https://www.github.com/googleapis/google-auth-library-python/compare/v1.27.0...v1.27.1) (2021-02-26)

##### Bug Fixes

-   ignore gcloud warning when getting project id ([#&#8203;708](https://www.github.com/googleapis/google-auth-library-python/issues/708)) ([3f2f3ea](https://www.github.com/googleapis/google-auth-library-python/commit/3f2f3eaf09006d3d0ec9c030d359114238479279))
-   use gcloud creds flow ([#&#8203;705](https://www.github.com/googleapis/google-auth-library-python/issues/705)) ([333cb76](https://www.github.com/googleapis/google-auth-library-python/commit/333cb765b52028329ec3ca04edf32c5764b1db68))

### [`v1.27.1`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;1271-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev1270v1271-2021-02-26)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v1.27.0...v1.27.1)

</details>

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packages/google-cloud-language/samples/snippets/api/requirements.txt

@@ -1,3 +1,3 @@
 google-api-python-client==1.12.8
-google-auth==1.27.0
+google-auth==1.30.0
 google-auth-httplib2==0.1.0