Bump micrometer-core from 1.8.0 to 1.8.1 (#281)

Bumps [micrometer-core](https://github.com/micrometer-metrics/micrometer) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.8.0...v1.8.1)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-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>

Author: dependabot[bot]

context-propagation-micrometer/pom.xml

@@ -36,7 +36,7 @@
         <project.moduleName>${project.groupId}.metrics</project.moduleName>
         <root.basedir>${project.parent.basedir}</root.basedir>
 
-        <micrometer.version>1.8.0</micrometer.version>
+        <micrometer.version>1.8.1</micrometer.version>
     </properties>
 
     <dependencies>