CI: Add rhel/9.3 for devel, remove rhel/9.2 (#7524)
* Add rhel/9.3 for devel, remove rhel/9.2.
* Also skip rhel/9.3 when skipping rhel/9.2.
* snapd is also on available on RHEL 9.3.
(cherry picked from commit 32fa588f47)
Co-authored-by: Felix Fontein <felix@fontein.de>