Bump org.mockito:mockito-core from 5.14.2 to 5.15.2

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.14.2 to 5.15.2.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.14.2...v5.15.2)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -56,7 +56,7 @@ repositories {
 ext {
   deps = [
     gocdPluginApi: 'cd.go.plugin:go-plugin-api:24.4.0',
-    mockito      : 'org.mockito:mockito-core:5.14.2',
+    mockito      : 'org.mockito:mockito-core:5.15.2',
   ]
 
   versions = project.ext.deps.collectEntries { lib, libGav -> [lib, libGav.split(':').last()] }