Bump org.assertj:assertj-bom from 3.27.4 to 3.27.6

Bumps [org.assertj:assertj-bom](https://github.com/assertj/assertj) from 3.27.4 to 3.27.6.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.27.4...assertj-build-3.27.6)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-bom
  dependency-version: 3.27.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -14,7 +14,7 @@ pulsar-reactive = "0.7.0"
 reactor = "2025.0.0-M7"
 spring = "7.0.0-M9"
 # tests
-assertj = "3.27.4"
+assertj = "3.27.6"
 awaitility = "4.3.0"
 jacoco = "0.8.9"
 json-path = "2.9.0"