deps: update dependency com.google.cloud:google-cloud-monitoring-dash…

…board-bom to v1.0.3 (#1128)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-monitoring-dashboard-bom](https://togithub.com/googleapis/java-monitoring-dashboards) | patch | `1.0.2` -> `1.0.3` |

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### Release Notes

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

### [`v1.0.3`](https://togithub.com/googleapis/java-monitoring-dashboards/blob/master/CHANGELOG.md#&#8203;103-httpswwwgithubcomgoogleapisjava-monitoring-dashboardscomparev102v103-2020-11-02)

[Compare Source](https://togithub.com/googleapis/java-monitoring-dashboards/compare/v1.0.2...v1.0.3)

</details>

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pom.xml

@@ -407,7 +407,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-monitoring-dashboard-bom</artifactId>
-        <version>1.0.2</version>
+        <version>1.0.3</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>