deps: update dependency com.google.cloud.tools:dependencies to v1.5.2 (#874)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud.tools:dependencies](https://github.com/GoogleCloudPlatform/cloud-opensource-java) | patch | `1.5.1` -> `1.5.2` |

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### Release Notes

<details>
<summary>GoogleCloudPlatform/cloud-opensource-java</summary>

### [`v1.5.2`](https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/master/CHANGELOG.md#&#8203;152)

-   Linkage Checker enforcer rule works with other repositories than Maven Central.

</details>

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Author: renovate-bot

dashboard/pom.xml

@@ -95,7 +95,7 @@
     <dependency>
       <groupId>com.google.cloud.tools</groupId>
       <artifactId>dependencies</artifactId>
-      <version>1.5.1</version>
+      <version>1.5.2</version>
     </dependency>
 
     <dependency>