Bump junit from 4.12 to 4.13

Bumps [junit](https://github.com/junit-team/junit4) from 4.12 to 4.13.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/master/doc/ReleaseNotes4.12.md)
- [Commits](junit-team/junit4@r4.12...r4.13)

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

build.gradle

@@ -69,7 +69,7 @@ dependencies {
     compile group: 'com.amazonaws', name: 'aws-java-sdk-ecr', version: '1.11.665'
     compile group: 'com.amazonaws', name: 'aws-java-sdk-sts', version: '1.11.665'
 
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testCompile group: 'junit', name: 'junit', version: '4.13'
     testCompile group: 'com.github.stefanbirkner', name: 'system-rules', version: '1.19.0'
     testCompile group: 'org.assertj', name: 'assertj-core', version: '3.14.0'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '3.2.4'