qemu_capabilities: Require QEMU-5.2.0 or newer

qemu_capabilities: Require QEMU-5.2.0 or newer

According to repology.org and/or distro repos these are the version of QEMU:

     CentOS Stream 9: qemu-kvm-9.0.0
           Debian 11: qemu-5.2.0
           Fedora 39: qemu-8.3.1
  openSUSE Leap 15.3: qemu-5.2.0
              RHEL-8: qemu-6.2.0
        Ubuntu 22.04: qemu-6.2.0

Since the minimal version is 5.2.0 we can bump from 4.2.0 to
5.2.0.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>