Relocated Kotlin to avoid interfering with other plugins
This update solves errors like these:
Java.lang.LinkageError: loader constraint violation: 'x' wants to load interface kotlin.jvm.functions.Function2. A different interface with the same name was previously loaded by 'CustomVoting.jar'. (kotlin.jvm.functions.Function2 is in unnamed module of loader 'CustomVoting.jar', parent loader java.net.URLClassLoader)