ci: Install python RPMs from libvirt/libvirt-python CI artifacts

ci: Install python RPMs from libvirt/libvirt-python CI artifacts

After addition of the new libvirt-client-qemu sub-package which is using
python bindings (thus creating a circular dependency between the libvirt
and libvirt-python projects) the integration jobs fail with:

  Error:
   Problem: conflicting requests
    - nothing provides python3-libvirt >= 8.9.0-1.el9 needed by libvirt-client-qemu-8.9.0-1.el9.x86_64

The libvirt-python project now provides the RPMs in artifacts:
 https://gitlab.com/libvirt/libvirt-python/-/merge_requests/96

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>