The CentOS project page shows that the 7 and 8 releases are deprecated.
https://www.centos.org/

Does the Kamailio community use these releases for prod?
If yes then I will keep the packaging for this release.

If not, I will remove the packaging for 7 and 8 releases, and in the future Kamailio will be packaged for 9 and 10 releases (planned).

https://www.phoronix.com/news/CentOS-Stream-10-Start
https://composes.stream.centos.org/stream-10/development/latest-CentOS-Stream/compose/BaseOS/x86_64/iso/
https://composes.stream.centos.org/stream-10/development/latest-CentOS-Stream/compose/BaseOS/x86_64/os/Packages/