fix(deps): update dependency com.google.api.grpc:proto-google-cloud-monitoring-v3 to v3.4.2 (#8285)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api.grpc:proto-google-cloud-monitoring-v3](https://togithub.com/googleapis/java-monitoring/proto-google-cloud-monitoring-v3) ([source](https://togithub.com/googleapis/java-monitoring)) | `3.4.2-SNAPSHOT` -> `3.4.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-monitoring-v3/3.4.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-monitoring-v3/3.4.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-monitoring-v3/3.4.2/compatibility-slim/3.4.2-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-cloud-monitoring-v3/3.4.2/confidence-slim/3.4.2-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) |

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java-monitoring/google-cloud-monitoring-bom/pom.xml

@@ -63,7 +63,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-monitoring-v3</artifactId>
-        <version>3.4.2-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-monitoring-v3:current} -->
+        <version>3.4.2</version><!-- {x-version-update:proto-google-cloud-monitoring-v3:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>

java-monitoring/pom.xml

@@ -61,7 +61,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-monitoring-v3</artifactId>
-        <version>3.4.2-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-monitoring-v3:current} -->
+        <version>3.4.2</version><!-- {x-version-update:proto-google-cloud-monitoring-v3:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>