fix: reduce capacity of LRU slice during Pop

x-pack/filebeat/input/netflow/decoder/v9/lru.go

@@ -43,7 +43,7 @@ func (h *pendingEventsHeap) Pop() any {
 	old := *h
 	n := len(old)
 	x := old[n-1]
-	*h = old[0 : n-1]
+	*h = old[0 : n-1 : n-1]
 	return x
 }