Bump io.micrometer:micrometer-bom from 1.12.8 to 1.12.9 (#3441)

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](micrometer-metrics/micrometer@v1.12.8...v1.12.9)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -61,7 +61,7 @@ ext {
 	kafkaVersion = '3.6.2'
 	log4jVersion = '2.21.1'
 	micrometerDocsVersion = '1.0.3'
-	micrometerVersion = '1.12.8'
+	micrometerVersion = '1.12.9'
 	micrometerTracingVersion = '1.2.8'
 	mockitoVersion = '5.6.0'
 	reactorVersion = '2023.0.8'