deps: update dependency com.google.cloud.tools:dependencies-parent to…

… v1.5.9 (#1969)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud.tools:dependencies-parent](https://github.com/GoogleCloudPlatform/cloud-opensource-java) | `1.5.8` -> `1.5.9` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud.tools:dependencies-parent/1.5.9/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud.tools:dependencies-parent/1.5.9/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud.tools:dependencies-parent/1.5.9/compatibility-slim/1.5.8)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud.tools:dependencies-parent/1.5.9/confidence-slim/1.5.8)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.5.9`](https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/master/CHANGELOG.md#&#8203;159)

-   Added an exclusion rule for invalid references in appengien-api-1.0-sdk ([#&#8203;2045](https://github.com/GoogleCloudPlatform/cloud-opensource-java/issues/2045))

</details>

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dashboard/pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>com.google.cloud.tools</groupId>
     <artifactId>dependencies-parent</artifactId>
-    <version>1.5.8</version>
+    <version>1.5.9</version>
   </parent>
   <artifactId>google-cloud-bom-dashboard</artifactId>
   <version>0.0.1-SNAPSHOT</version>