Fix rpmlint CI job
This PR fixes the failures in the rpmlint job in the packaging GHA workflow; centos:8 is dead, long live rockylinux:8!
Maintenance will be performed on git.ligo.org, containers.ligo.org, and docs.ligo.org on Tuesday 2 July 2024 starting at approximately 9:30am PDT. It is expected to take around two hours and there will be several periods of downtime throughout the maintenance. Please address any comments, concerns, or questions to the helpdesk.
This PR fixes the failures in the rpmlint job in the packaging GHA workflow; centos:8 is dead, long live rockylinux:8!