fix(deps): update dependency com.google.cloud:google-cloud-monitoring-bom to v3.4.2 (googleapis#8290)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-monitoring-bom](https://togithub.com/googleapis/java-monitoring) | `3.4.2-SNAPSHOT` -> `3.4.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-bom/3.4.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-bom/3.4.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-bom/3.4.2/compatibility-slim/3.4.2-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-bom/3.4.2/confidence-slim/3.4.2-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

google-cloud-gapic-bom/pom.xml

@@ -374,7 +374,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-monitoring-bom</artifactId>
-        <version>3.4.2-SNAPSHOT</version><!-- {x-version-update:google-cloud-monitoring:current} -->
+        <version>3.4.2</version><!-- {x-version-update:google-cloud-monitoring:current} -->
         <type>pom</type>
         <scope>import</scope>
       </dependency>