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](https://github.com/junit-team/junit4/compare/r4.12...r4.13)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

android/build.gradle

@@ -173,7 +173,7 @@ dependencies {
     implementation 'com.chibatching.kotpref:initializer:2.10.0'
     testImplementation 'androidx.annotation:annotation:1.1.0'
     testImplementation 'com.squareup.assertj:assertj-android:1.2.0'
-    testImplementation 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.13'
     testImplementation "org.mockito:mockito-core:$mockito_version"
     testImplementation 'org.threeten:threetenbp:1.4.1'