Bump io.micrometer:micrometer-observation from 1.12.7 to 1.12.8

Bumps [io.micrometer:micrometer-observation](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-observation
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

gradle/libs.versions.toml

@@ -26,7 +26,7 @@ com-squareup-okhttp3-mockwebserver = { module = "com.squareup.okhttp3:mockwebser
 com-squareup-okhttp3-okhttp = { module = "com.squareup.okhttp3:okhttp", version.ref = "com-squareup-okhttp3" }
 com-unboundid-unboundid-ldapsdk = "com.unboundid:unboundid-ldapsdk:6.0.11"
 commons-collections = "commons-collections:commons-collections:3.2.2"
-io-micrometer-micrometer-observation = "io.micrometer:micrometer-observation:1.12.7"
+io-micrometer-micrometer-observation = "io.micrometer:micrometer-observation:1.12.8"
 io-mockk = "io.mockk:mockk:1.13.11"
 io-projectreactor-reactor-bom = "io.projectreactor:reactor-bom:2023.0.7"
 io-rsocket-rsocket-bom = { module = "io.rsocket:rsocket-bom", version.ref = "io-rsocket" }