Bump io.micrometer:micrometer-bom from 1.13.6 to 1.13.8 (#9657)

Bumps [io.micrometer:micrometer-bom](https://github.com/micrometer-metrics/micrometer) from 1.13.6 to 1.13.8.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](https://github.com/micrometer-metrics/micrometer/compare/v1.13.6...v1.13.8)

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

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build.gradle

@@ -94,7 +94,7 @@ ext {
     log4jVersion = '2.23.1'
     mailVersion = '2.0.3'
     micrometerTracingVersion = '1.3.5'
-    micrometerVersion = '1.13.6'
+    micrometerVersion = '1.13.8'
     mockitoVersion = '5.11.0'
     mongoDriverVersion = '5.0.1'
     mysqlVersion = '8.3.0'