Bump org.assertj:assertj-core from 3.27.5 to 3.27.6 in /devtools/gradle

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.27.5 to 3.27.6.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.27.5...assertj-build-3.27.6)

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

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 7299e04)

Author: dependabot[bot]

devtools/gradle/gradle/libs.versions.toml

@@ -5,7 +5,7 @@ kotlin = "2.2.20"
 smallrye-config = "3.13.4"
 
 junit5 = "5.13.4"
-assertj = "3.27.5"
+assertj = "3.27.6"
 
 [plugins]
 plugin-publish = { id = "com.gradle.plugin-publish", version.ref = "plugin-publish" }