deps: update dependency com.google.cloud:google-cloud-securitycenter-…

…bom to v1.5.1 (#2047)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-securitycenter-bom](https://github.com/googleapis/java-securitycenter) | `1.5.0` -> `1.5.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-securitycenter-bom/1.5.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-securitycenter-bom/1.5.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-securitycenter-bom/1.5.1/compatibility-slim/1.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-securitycenter-bom/1.5.1/confidence-slim/1.5.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.5.1`](https://github.com/googleapis/java-securitycenter/blob/master/CHANGELOG.md#&#8203;151-httpswwwgithubcomgoogleapisjava-securitycentercomparev150v151-2021-05-14)

[Compare Source](https://github.com/googleapis/java-securitycenter/compare/v1.5.0...v1.5.1)

</details>

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### Configuration

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pom.xml

@@ -529,7 +529,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-securitycenter-bom</artifactId>
-        <version>1.5.0</version>
+        <version>1.5.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>