chore(deps): update dependency google-cloud-build to v3.3.1 (#140)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-build](https://togithub.com/googleapis/python-cloudbuild) | `==3.3.0` -> `==3.3.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-build/3.3.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-build/3.3.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-build/3.3.1/compatibility-slim/3.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-build/3.3.1/confidence-slim/3.3.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-cloudbuild</summary>

### [`v3.3.1`](https://togithub.com/googleapis/python-cloudbuild/blob/master/CHANGELOG.md#&#8203;331-httpswwwgithubcomgoogleapispython-cloudbuildcomparev330v331-2021-07-24)

[Compare Source](https://togithub.com/googleapis/python-cloudbuild/compare/v3.3.0...v3.3.1)

</details>

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Author: renovate-bot

cloudbuild/snippets/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-build==3.3.0
+google-cloud-build==3.3.1
 google-auth==1.33.1