Bump junit from 4.11 to 4.12

Bumps [junit](https://github.com/junit-team/junit) from 4.11 to 4.12.
- [Release notes](https://github.com/junit-team/junit/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/master/doc/ReleaseNotes4.12.md)
- [Commits](junit-team/junit4@r4.11...r4.12)

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

Author: dependabot-preview[bot]

build.gradle

@@ -32,7 +32,7 @@ dependencies {
     compileOnly group: 'cd.go.plugin', name: 'go-plugin-api', version: project.pluginDesc.goCdVersion
     testCompile group: 'cd.go.plugin', name: 'go-plugin-api', version: project.pluginDesc.goCdVersion
 
-    testCompile group: 'junit', name: 'junit', version: '4.11'
+    testCompile group: 'junit', name: 'junit', version: '4.12'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '3.0.0'
     testCompile group: 'org.hamcrest', name: 'hamcrest-core', version: '1.3'
 }