I posted about this issue a couple or so weeks ago:
This problem continues to occur, it’s happening to me today. Before, and today, the server IP address failing is the same:
403 Forbidden [IP: 92.222.135.198 80]
I think there’s something wrong with that machine, or all these issues coincide with some update running there.
When this happens, I need to disable the xwiki source in order to do a succesful apt update.
-Alan