Work around #2164207 for Rawhide update base images
    
    Rawhide update tests are all failing ATM due to
    https://bugzilla.redhat.com/show_bug.cgi?id=2164207 . This should
    work around the problem by including the latest version of
    python3-ptyprocess in the base image.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>