maybe leak: ConcurrentCollection use Lock but seems never close() it

[Rowandjj]

ConcurrentMutableCollection use Lock but never close() it.

actual class Lock actual constructor() {
    private val arena = Arena()
    private val attr = arena.alloc<pthread_mutexattr_t>()
    private val mutex = arena.alloc<pthread_mutex_t>()
    
    ....
    fun internalClose() {
        pthread_mutex_destroy(mutex.ptr)
        pthread_mutexattr_destroy(attr.ptr)
        arena.clear()
    }
}

actual inline fun Lock.close() {
    internalClose()
}