deps: update dependency com.google.cloud:google-cloud-monitoring-dashboard-bom to v0.2.1 (#785)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-monitoring-dashboard-bom](https://github.com/googleapis/java-monitoring-dashboards) | patch | `0.2.0` -> `0.2.1` |

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### Release Notes

<details>
<summary>googleapis/java-monitoring-dashboards</summary>

### [`v0.2.1`](https://github.com/googleapis/java-monitoring-dashboards/blob/master/CHANGELOG.md#&#8203;021-httpswwwgithubcomgoogleapisjava-monitoring-dashboardscomparev020v021-2020-08-07)

[Compare Source](https://github.com/googleapis/java-monitoring-dashboards/compare/v0.2.0...v0.2.1)

</details>

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Author: renovate-bot

pom.xml

@@ -434,7 +434,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-monitoring-dashboard-bom</artifactId>
-        <version>0.2.0</version>
+        <version>0.2.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>