Require python-ldap with fix for ref counting bug
    
    python-ldap 3.1.0 and python3-pyldap 2.4.37-4 fix a segfault caused by
    a reference counting bug.
    
    See: https://pagure.io/freeipa/issue/7324
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>