Bump org.mockito:mockito-core from 5.5.0 to 5.6.0 (#12)

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.5.0...v5.6.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -77,7 +77,7 @@ dependencies {
     implementation group: 'com.squareup.okhttp3', name: 'okhttp', version: '4.11.0'
 
     testImplementation project.deps.gocdPluginApi
-    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.5.0'
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.6.0'
     testImplementation group: 'org.hamcrest', name: 'hamcrest', version: '2.2'
     testImplementation group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.1'
     testImplementation group: 'org.jsoup', name: 'jsoup', version: '1.16.1'