See tracker.
Ping.
dev-util/rbtools-4.x no longer requires nose, so this should be fixed in a couple of weeks once rbtools 4.x is stable.
commit d5c968d363058c6ef2019c815ad5bb8ea119d852 Author: Hans de Graaff <graaff@gentoo.org> Date: Sun Feb 12 12:07:42 2023 +0100 dev-util/rbtools: drop 3.1.1, 3.1.2