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>

build.gradle

@@ -350,7 +350,7 @@ dependencies {
     kapt "io.noties:prism4j-bundler:$prismVersion"
 
     // dependencies for local unit tests
-    testImplementation 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.13'
     testImplementation 'org.mockito:mockito-core:3.2.4'
     testImplementation 'androidx.test:core:1.2.0'
     testImplementation 'org.powermock:powermock-core:2.0.4'