Bump micrometer-test from 1.9.2 to 1.9.4

Bumps [micrometer-test](https://github.com/micrometer-metrics/micrometer) from 1.9.2 to 1.9.4.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.9.2...v1.9.4)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-test
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

micrometer-registry-signalfx/pom.xml

@@ -72,7 +72,7 @@
     <dependency>
       <groupId>io.micrometer</groupId>
       <artifactId>micrometer-test</artifactId>
-      <version>1.9.2</version>
+      <version>1.9.4</version>
       <scope>test</scope>
     </dependency>
     <dependency>