Bump io.dropwizard.metrics:metrics-jvm in /cc-metrics-reporter (#732)

Bumps [io.dropwizard.metrics:metrics-jvm](https://github.com/dropwizard/metrics) from 4.2.20 to 4.2.21.
- [Release notes](https://github.com/dropwizard/metrics/releases)
- [Commits](dropwizard/metrics@v4.2.20...v4.2.21)

---
updated-dependencies:
- dependency-name: io.dropwizard.metrics:metrics-jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cc-metrics-reporter/build.gradle

@@ -30,7 +30,7 @@ dependencies {
     implementation group: 'org.slf4j', name: 'slf4j-api', version: '2.0.9'
     implementation group: 'com.google.guava', name: 'guava', version: '32.1.3-jre'
     implementation group: 'io.dropwizard.metrics', name: 'metrics-core', version: '4.2.21'
-    implementation group: 'io.dropwizard.metrics', name: 'metrics-jvm', version: '4.2.20'
+    implementation group: 'io.dropwizard.metrics', name: 'metrics-jvm', version: '4.2.21'
     implementation group: 'io.dropwizard.metrics', name: 'metrics-graphite', version: '4.2.21'
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'
 }