I misread the announcement and thought CUPS had already been deprecated, so I uninstalled it. Samba seems to be working, even tho cups is still listed as a dependency.
# pakfire info samba
Name: samba
Summary: A SMB/CIFS File, Print, and Authentication Server
Version: 4.21.0-105
Size: 12.27 MB
Dependencies: avahi cups perl-Parse-Yapp perl-JSON wsdd
Pakfile: samba-4.21.0-105.ipfire
Service InitScripts: samba
Installed: yes
Status: up-to-date