Bump junit from 4.12 to 4.13.2

Bumps [junit](https://github.com/junit-team/junit4) from 4.12 to 4.13.2.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.12.md)
- [Commits](junit-team/junit4@r4.12...r4.13.2)

build.gradle

@@ -29,7 +29,7 @@ repositories {
 }
 
 dependencies {
-  testImplementation(group: 'junit', name: 'junit', version: '4.12')
+  testImplementation(group: 'junit', name: 'junit', version: '4.13.2')
 
   compile group: 'junit', name: 'junit', version: '4.12'
   compile group: 'org.assertj',           name: 'assertj-core',   version: '3.4.1'