build(deps): bump micrometer-core from 1.9.3 to 1.9.4 (#1746)

Bumps [micrometer-core](https://github.com/micrometer-metrics/micrometer) from 1.9.3 to 1.9.4.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.9.3...v1.9.4)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

micrometer/pom.xml

@@ -42,7 +42,7 @@
     <dependency>
       <groupId>io.micrometer</groupId>
       <artifactId>micrometer-core</artifactId>
-      <version>1.9.3</version>
+      <version>1.9.4</version>
     </dependency>
     <dependency>
       <groupId>org.mockito</groupId>