Bump org.assertj:assertj-core from 3.15.0 to 3.25.1

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.15.0 to 3.25.1.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-core-3.15.0...assertj-build-3.25.1)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -50,7 +50,7 @@
         <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
 
         <!-- dependencies versions -->
-        <assertj.version>3.15.0</assertj.version>
+        <assertj.version>3.25.1</assertj.version>
         <dtkit-api.version>3.0.2</dtkit-api.version>
         <xmlunit.version>2.9.1</xmlunit.version>
     </properties>