Upgrade JUnit for Kotlin, add kotlinx.test

Kotlin/build.gradle.kts

@@ -14,7 +14,8 @@ repositories {
 
 dependencies {
 	implementation(kotlin("stdlib"))
-	testImplementation("org.junit.jupiter:junit-jupiter:5.10.0")
+	testImplementation(kotlin("test"))
+	testImplementation("org.junit.jupiter:junit-jupiter:5.12.2")
 }
 
 tasks.test {