Bump the gradle-deps group with 3 updates

Bumps the gradle-deps group with 3 updates: [org.junit:junit-bom](https://github.com/junit-team/junit-framework), [com.google.code.gson:gson](https://github.com/google/gson) and [org.mockito:mockito-core](https://github.com/mockito/mockito).


Updates `org.junit:junit-bom` from 5.13.4 to 6.0.0
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r5.13.4...r6.0.0)

Updates `com.google.code.gson:gson` from 2.13.1 to 2.13.2
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/main/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.13.1...gson-parent-2.13.2)

Updates `org.mockito:mockito-core` from 5.19.0 to 5.20.0
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.19.0...v5.20.0)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: gradle-deps
- dependency-name: com.google.code.gson:gson
  dependency-version: 2.13.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle-deps
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.20.0
  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

@@ -65,16 +65,16 @@ ext {
 
 dependencies {
     compileOnly project.deps.gocdPluginApi
-    implementation group: 'com.google.code.gson', name: 'gson', version: '2.13.1'
+    implementation group: 'com.google.code.gson', name: 'gson', version: '2.13.2'
     implementation group: 'com.squareup.okhttp3', name: 'okhttp', version: '5.1.0'
 
     testImplementation project.deps.gocdPluginApi
-    testImplementation platform('org.junit:junit-bom:5.13.4')
+    testImplementation platform('org.junit:junit-bom:6.0.0')
     testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api'
     testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-params'
     testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine'
     testRuntimeOnly group: 'org.junit.platform', name: 'junit-platform-launcher'
-    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.19.0'
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.20.0'
     testImplementation group: 'org.hamcrest', name: 'hamcrest', version: '3.0'
     testImplementation group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.3'
     testImplementation group: 'com.squareup.okhttp3', name: 'mockwebserver3-junit5', version: '5.1.0'