build(deps): bump io.micrometer:micrometer-registry-prometheus

Bumps [io.micrometer:micrometer-registry-prometheus](https://github.com/micrometer-metrics/micrometer) from 1.15.3 to 1.15.4.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.15.3...v1.15.4)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-registry-prometheus
  dependency-version: 1.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -34,7 +34,7 @@ apacheCxf="3.6.8"
 node="22.19.0"
 modelixBuildtools="1.9.0"
 openapi = "7.15.0"
-micrometer = "1.15.3"
+micrometer = "1.15.4"
 detekt = "1.23.8"
 xmlunit = "2.10.3"
 kotest = "6.0.2"