Bump io.micrometer:micrometer-tracing-bom from 1.2.7 to 1.2.8 (#3368)

Bumps [io.micrometer:micrometer-tracing-bom](https://github.com/micrometer-metrics/tracing) from 1.2.7 to 1.2.8.
- [Release notes](https://github.com/micrometer-metrics/tracing/releases)
- [Commits](micrometer-metrics/tracing@v1.2.7...v1.2.8)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-tracing-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

@@ -63,7 +63,7 @@ ext {
 	log4jVersion = '2.21.1'
 	micrometerDocsVersion = '1.0.3'
 	micrometerVersion = '1.12.8'
-	micrometerTracingVersion = '1.2.7'
+	micrometerTracingVersion = '1.2.8'
 	mockitoVersion = '5.6.0'
 	reactorVersion = '2023.0.8'
 	scalaVersion = '2.13'