Bump io.micrometer:micrometer-tracing-bom

Bumps [io.micrometer:micrometer-tracing-bom](https://github.com/micrometer-metrics/tracing) from 1.6.0-M1 to 1.6.0-SNAPSHOT.
- [Release notes](https://github.com/micrometer-metrics/tracing/releases)
- [Commits](https://github.com/micrometer-metrics/tracing/commits)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-tracing-bom
  dependency-version: 1.6.0-SNAPSHOT
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -64,7 +64,7 @@ ext {
 	log4jVersion = '2.24.3'
 	micrometerDocsVersion = '1.0.4'
 	micrometerVersion = '1.16.0-SNAPSHOT'
-	micrometerTracingVersion = '1.6.0-M1'
+	micrometerTracingVersion = '1.6.0-SNAPSHOT'
 	mockitoVersion = '5.18.0'
 	reactorVersion = '2025.0.0-M5'
 	scalaVersion = '2.13'