Disallow transitive JUnit 4 and JUnit 5 Vintage dependencies in all Gradle configurations.

build.gradle.kts

configurations.all {
    // If this configuration supports transitive dependencies then we
    // exclude any transitive JUnit 4 dependencies from all dependencies
    // that are declared in this configuration. This means that users have
    // to define an explicit dependency on JUnit 4 if they want to use it.
    if (isTransitive) {
        withDependencies {
            forEach {
                (it as? ExternalModuleDependency)
                    ?.takeIf { it.group != "org.junit.vintage" }
                    ?.exclude("junit", "junit")
                    ?.exclude("org.junit.vintage")
            }
        }
    }
}