Bump metrics.version from 4.1.6 to 4.1.8 (#1324)

Bumps `metrics.version` from 4.1.6 to 4.1.8.

Updates `metrics-core` from 4.1.6 to 4.1.8
- [Release notes](https://github.com/dropwizard/metrics/releases)
- [Commits](dropwizard/metrics@v4.1.6...v4.1.8)

Updates `metrics-servlets` from 4.1.6 to 4.1.8
- [Release notes](https://github.com/dropwizard/metrics/releases)
- [Commits](dropwizard/metrics@v4.1.6...v4.1.8)

Updates `metrics-servlet` from 4.1.6 to 4.1.8
- [Release notes](https://github.com/dropwizard/metrics/releases)
- [Commits](dropwizard/metrics@v4.1.6...v4.1.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Aaron Klish <aklish@gmail.com>

elide-standalone/pom.xml

@@ -48,7 +48,7 @@
     <properties>
         <!-- Versions -->
         <logback.version>1.2.3</logback.version>
-        <metrics.version>4.1.6</metrics.version>
+        <metrics.version>4.1.8</metrics.version>
 
         <!-- Settings -->
         <project.build.sourceEncoding>utf-8</project.build.sourceEncoding>