[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

plugins/atomicfu/atomicfu-compiler/build.gradle.kts

@@ -83,7 +83,7 @@ dependencies {
     testImplementation(projectTests(":generators:test-generator"))
 
     testImplementation(projectTests(":js:js.tests"))
-    testApi(commonDependency("junit:junit"))
+    testApi(libs.junit4)
     testApi(project(":kotlin-test:kotlin-test-jvm"))
 
     // Dependencies for Kotlin/Native test infra:
@@ -147,7 +147,7 @@ dependencies {
 
     testImplementation("org.jetbrains.kotlinx:atomicfu:0.21.0")
 
-    testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.9.1")
+    testRuntimeOnly(libs.junit.vintage.engine)
 }
 
 optInToExperimentalCompilerApi()