Fix compatibility with jsonschema >= 4.0.0
    
    Fedora Rawhide (to be 37) packages jsonschema 4.9.0 at the moment, so we
    can no longer get by with limiting the requirements. This patch makes
    the validation work with both old and new version.
    
    Fixes: rhbz#2113607
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>