Bump io.micrometer:micrometer-bom from 1.12.7 to 1.12.8 (#747)

Bumps [io.micrometer:micrometer-bom](https://github.com/micrometer-metrics/micrometer) from 1.12.7 to 1.12.8.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.12.7...v1.12.8)

---
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]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ caffeine = "3.1.8"
 jackson = "2.15.4"
 jsr305 = "3.0.2"
 logback = "1.4.14"
-micrometer = "1.12.7"
+micrometer = "1.12.8"
 micrometer-docs-gen = "1.0.2"
 micrometer-tracing = "1.2.7"
 protobuf = "3.21.12"