pylint: Fix unhashable-member
    
    https://pylint.pycqa.org/en/latest/user_guide/messages/error/unhashable-member.html:
    > Emitted when a dict key or set member is not hashable (i.e. doesn't
    define __hash__ method).
    
    https://docs.python.org/3/library/stdtypes.html#dict.update:
    > Update the dictionary with the key/value pairs from other, overwriting
    existing keys. Return None.
    update() accepts either another dictionary object or an iterable of
    key/value pairs (as tuples or other iterables of length two). If keyword
    arguments are specified, the dictionary is then updated with those
    key/value pairs: d.update(red=1, blue=2).
    
    Fixes: https://pagure.io/freeipa/issue/9278
    Signed-off-by: Stanislav Levin <slev@altlinux.org>
    Reviewed-By: Stanislav Levin <slev@altlinux.org>