[Build] Move JUnit dependencies into the version catalog

The `kotlin-test` dependencies are left untouched as changing them affects publications, thus these versions are independent from the used inside our build
#KTI-1349 In Progress

libraries/examples/scripting/jvm-simple-script/host/build.gradle.kts

@@ -8,7 +8,7 @@ dependencies {
     api(project(":kotlin-scripting-jvm-host-unshaded"))
     testRuntimeOnly(project(":kotlin-compiler"))
     testRuntimeOnly(project(":kotlin-scripting-compiler"))
-    testApi(commonDependency("junit"))
+    testApi(libs.junit4)
 }
 
 sourceSets {