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:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -74,7 +74,7 @@ subprojects { Project sub ->
 
         testImplementation project.deps.gocdPluginApi
         testImplementation 'org.mockito:mockito-core:5.12.0'
-        testImplementation group: 'org.assertj', name: 'assertj-core', version: '3.26.0'
+        testImplementation group: 'org.assertj', name: 'assertj-core', version: '3.26.3'
         testImplementation platform('org.junit:junit-bom:5.10.3')
         testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api'
         testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine'