Bump the gradle-deps group with 2 updates

Bumps the gradle-deps group with 2 updates: [cd.go.plugin:go-plugin-api](https://github.com/gocd/gocd) and [org.mockito:mockito-core](https://github.com/mockito/mockito).


Updates `cd.go.plugin:go-plugin-api` from 25.3.0 to 25.4.0
- [Release notes](https://github.com/gocd/gocd/releases)
- [Commits](gocd/gocd@25.3.0...25.4.0)

Updates `org.mockito:mockito-core` from 5.20.0 to 5.21.0
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.20.0...v5.21.0)

---
updated-dependencies:
- dependency-name: cd.go.plugin:go-plugin-api
  dependency-version: 25.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle-deps
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle-deps
...

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

Author: dependabot[bot]

build.gradle

@@ -61,7 +61,7 @@ repositories {
 
 ext {
     deps = [
-        gocdPluginApi: 'cd.go.plugin:go-plugin-api:25.3.0',
+        gocdPluginApi: 'cd.go.plugin:go-plugin-api:25.4.0',
     ]
 
     versions = project.ext.deps.collectEntries { lib, libGav -> [lib, libGav.split(':').last()] }
@@ -77,7 +77,7 @@ dependencies {
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 
-    testImplementation 'org.mockito:mockito-core:5.20.0'
+    testImplementation 'org.mockito:mockito-core:5.21.0'
     testImplementation 'org.assertj:assertj-core:3.27.6'
     testImplementation "cd.go.plugin:go-plugin-api:${project.versions.gocdPluginApi}"
 }