Prepare 1.4.2.1 release

Author: mannodermaus

buildSrc/src/main/kotlin/Artifacts.kt

@@ -35,7 +35,7 @@ object Artifacts {
       platform = Java,
       groupId = "de.mannodermaus.gradle.plugins",
       artifactId = "android-junit5",
-      currentVersion = "1.4.2.1-SNAPSHOT",
+      currentVersion = "1.4.2.1",
       latestStableVersion = "1.4.2.0",
       license = license,
       description = "Unit Testing with JUnit 5 for Android."