Bump cd.go.plugin:go-plugin-api from 23.3.0 to 23.4.0

Bumps [cd.go.plugin:go-plugin-api](https://github.com/gocd/gocd) from 23.3.0 to 23.4.0.
- [Release notes](https://github.com/gocd/gocd/releases)
- [Commits](gocd/gocd@23.3.0...23.4.0)

---
updated-dependencies:
- dependency-name: cd.go.plugin:go-plugin-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

dependencies.gradle

@@ -38,7 +38,7 @@ final Map<String, String> libraries = [
   junitJupiterApi   : 'org.junit.jupiter:junit-jupiter-api:5.10.0',
   lombok            : 'org.projectlombok:lombok:1.18.30',
   mockito           : 'org.mockito:mockito-core:5.6.0',
-  pluginApi         : 'cd.go.plugin:go-plugin-api:23.3.0',
+  pluginApi         : 'cd.go.plugin:go-plugin-api:23.4.0',
   reflections       : 'org.reflections:reflections:0.10.2',
   retrofit          : 'com.squareup.retrofit2:retrofit:2.9.0',
   slf4j             : 'org.slf4j:slf4j-simple:2.0.9',