py3: Fix searching for yubikeys
    
    Bumping the requirements for the python-yubikey package. This is
    unfortunately most probably fixed only in Fedora because there was no
    upstream release for about a year and a half now. That also means
    bumping the version in ipasetup.py.in would be pointless.
    
    https://pagure.io/freeipa/issue/7121
    
    Reviewed-By: Tomas Krizek <tkrizek@redhat.com>