Bump io.micrometer:micrometer-bom from 1.12.8 to 1.12.9 (#9396)

Bumps [io.micrometer:micrometer-bom](https://github.com/micrometer-metrics/micrometer) from 1.12.8 to 1.12.9.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](https://github.com/micrometer-metrics/micrometer/compare/v1.12.8...v1.12.9)

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

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build.gradle

@@ -93,7 +93,7 @@ ext {
     log4jVersion = '2.21.1'
     mailVersion = '2.0.3'
     micrometerTracingVersion = '1.2.8'
-    micrometerVersion = '1.12.8'
+    micrometerVersion = '1.12.9'
     mockitoVersion = '5.7.0'
     mongoDriverVersion = '4.11.3'
     mysqlVersion = '8.0.33'