chore(deps): update dependency com.google.cloud:google-cloud-build to…

… v2.7.0 (#566)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-build](https://togithub.com/googleapis/java-cloudbuild) | `2.6.3` -> `2.7.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build/2.7.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build/2.7.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build/2.7.0/compatibility-slim/2.6.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build/2.7.0/confidence-slim/2.6.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.7.0`](https://togithub.com/googleapis/java-cloudbuild/releases/v2.7.0)

[Compare Source](https://togithub.com/googleapis/java-cloudbuild/compare/v2.6.4...v2.7.0)

##### Features

*   configure initial sp version ([#​550](https://www.togithub.com/googleapis/java-cloudbuild/issues/550)) ([f42dd28](https://www.togithub.com/googleapis/java-cloudbuild/commit/f42dd28c818b4fd06965487576474533941f290e))

### [`v2.6.4`](https://togithub.com/googleapis/java-cloudbuild/blob/master/CHANGELOG.md#​264-httpswwwgithubcomgoogleapisjava-cloudbuildcomparev263v264-2021-08-06)

[Compare Source](https://togithub.com/googleapis/java-cloudbuild/compare/v2.6.3...v2.6.4)

</details>

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