deps: update dependency com.google.cloud:google-cloud-service-managem…

…ent-bom to v2.1.6 (#3578)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-service-management-bom](https://togithub.com/googleapis/java-service-management) | `2.1.5` -> `2.1.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-service-management-bom/2.1.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-service-management-bom/2.1.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-service-management-bom/2.1.6/compatibility-slim/2.1.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-service-management-bom/2.1.6/confidence-slim/2.1.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-service-management</summary>

### [`v2.1.6`](https://togithub.com/googleapis/java-service-management/blob/HEAD/CHANGELOG.md#&#8203;216-httpsgithubcomgoogleapisjava-service-managementcomparev215v216-2022-02-03)

[Compare Source](https://togithub.com/googleapis/java-service-management/compare/v2.1.5...v2.1.6)

</details>

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pom.xml

@@ -653,7 +653,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-service-management-bom</artifactId>
-        <version>2.1.5</version>
+        <version>2.1.6</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>