Please branch and build virglrenderer in epel9. If you do not wish to maintain virglrenderer 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/virglrenderer/addgroup and grant it commit access, or collaborator access on epel* branches.
Will you be able to branch and build virglrenderer in epel9? The EPEL Packagers SIG would be happy to be a co-maintainer if you do not wish to build it on epel9.