Bump metrics-core from 4.2.0 to 4.2.1 (#2525)

Bumps [metrics-core](https://github.com/dropwizard/metrics) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/dropwizard/metrics/releases)
- [Commits](dropwizard/metrics@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: io.dropwizard.metrics:metrics-core
  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>

ktor-features/ktor-metrics/build.gradle.kts

@@ -3,7 +3,7 @@ kotlin {
     sourceSets {
         val jvmMain by getting {
             dependencies {
-                api("io.dropwizard.metrics:metrics-core:4.2.0")
+                api("io.dropwizard.metrics:metrics-core:4.2.1")
                 api("io.dropwizard.metrics:metrics-jvm:4.2.0")
             }
         }