fix(deps): update dependency com.google.cloud:google-cloud-monitoring-parent to v3.4.2 (#8291)

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This PR contains the following updates:

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

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

@@ -11,7 +11,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-monitoring-parent</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} -->
   </parent>
   <properties>
     <site.installationModule>google-cloud-monitoring</site.installationModule>

java-monitoring/grpc-google-cloud-monitoring-v3/pom.xml

@@ -10,7 +10,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-monitoring-parent</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} -->
   </parent>
   <dependencies>
     <dependency>

java-monitoring/proto-google-cloud-monitoring-v3/pom.xml

@@ -10,7 +10,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-monitoring-parent</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} -->
   </parent>
   <dependencies>
     <dependency>