Bump io.micrometer:micrometer-bom from 1.13.4 to 1.13.6 (#870)

Bumps [io.micrometer:micrometer-bom](https://github.com/micrometer-metrics/micrometer) from 1.13.4 to 1.13.6.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.13.4...v1.13.6)

---
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

@@ -1,5 +1,5 @@
 [versions]
-micrometer = "1.13.4"
+micrometer = "1.13.6"
 micrometerContextPropagation="1.1.2"
 junit = "5.10.5"
 javaxServlet="4.0.1"