Bump junit from 4.12 to 4.13 (projectlombok#723)

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

@@ -87,7 +87,7 @@ configurations {
 dependencies {
   lombok group: 'org.projectlombok', name: 'lombok', version: '1.18.10', classifier: 'sources', ext: 'jar'
 
-  testImplementation("junit:junit:4.12")
+  testImplementation("junit:junit:4.13")
   testImplementation("org.mockito:mockito-core:3.2.4")
   testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.5.2")
 }