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] <[email protected]>

build.gradle

@@ -71,7 +71,7 @@ dependencies {
     testRuntimeOnly group: 'org.junit.platform', name: 'junit-platform-launcher'
 
     testImplementation group: 'org.mockito', name: 'mockito-core', version: '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 group: 'cd.go.plugin', name: 'go-plugin-api', version: project.versions.gocdPluginApi
 }