Bump org.assertj:assertj-core from 3.26.0 to 3.26.3

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.26.0 to 3.26.3.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.26.0...assertj-build-3.26.3)

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

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

pom.xml

@@ -84,7 +84,7 @@
         <jenkins-plugins-bom.artifactId>bom-2.426.x</jenkins-plugins-bom.artifactId>
         <jenkins-plugins-bom.version>3157.vb_3e8b_8a_d185d</jenkins-plugins-bom.version>
 
-        <assertj.version>3.26.0</assertj.version>
+        <assertj.version>3.26.3</assertj.version>
         <checkstyle.version>10.17.0</checkstyle.version>
     </properties>