Since Fedora 40 was released recently, Fedora 38 is now
unsupported. Drop Fedora 38 and introduce Fedora 40 to our CI.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
