deps: update dependency com.google.cloud:google-cloud-build-bom to v3…

….3.8 (#3504)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-build-bom](https://togithub.com/googleapis/java-cloudbuild) | `3.3.7` -> `3.3.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/3.3.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/3.3.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/3.3.8/compatibility-slim/3.3.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/3.3.8/confidence-slim/3.3.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v3.3.8`](https://togithub.com/googleapis/java-cloudbuild/blob/HEAD/CHANGELOG.md#&#8203;338-httpsgithubcomgoogleapisjava-cloudbuildcomparev337v338-2022-02-03)

[Compare Source](https://togithub.com/googleapis/java-cloudbuild/compare/v3.3.7...v3.3.8)

</details>

---

### Configuration

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pom.xml

@@ -261,7 +261,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-build-bom</artifactId>
-        <version>3.3.7</version>
+        <version>3.3.8</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>