Please branch and build dbus-python in epel9. If you do not wish to maintain dbus-python in epel9, or do not think you will be able to do this in a timely manner, the EPEL Packagers SIG would be happy to be a co-maintainer of the package; please add the epel-packagers-sig group through https://src.fedoraproject.org/rpms/dbus-python/addgroup and grant it commit access, or collaborator access on epel* branches. I would also be happy to be a co-maintainer (FAS: jonathanspw). I can be the primary contact for EPEL (FAS: jonathanspw).
The current rawhide branch builds against EPEL9 successfully. https://koji.fedoraproject.org/koji/taskinfo?taskID=95790614
Closing this as "not a bug" because dbus-python 1.12.8 (python3-dbus package) is already available in the BaseOS repository of RHEL/CentOS. (If you need a newer version, you need to report a bug against RHEL/CentOS, we can't package newer versions of RHEL packages in EPEL.)