Bump org.mockito:mockito-bom from 5.11.0 to 5.12.0

Bumps [org.mockito:mockito-bom](https://github.com/mockito/mockito) from 5.11.0 to 5.12.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.11.0...v5.12.0)

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

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

build.gradle

@@ -112,7 +112,7 @@ dependencies {
 
   testImplementation project.deps.gocdPluginApi
   testImplementation group: 'org.hamcrest', name: 'hamcrest', version: '2.2'
-  testImplementation platform('org.mockito:mockito-bom:5.11.0')
+  testImplementation platform('org.mockito:mockito-bom:5.12.0')
   testImplementation group: 'org.mockito', name: 'mockito-core'
   testImplementation group: 'org.mockito', name: 'mockito-junit-jupiter'
   testImplementation group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.1'