TST: fix intermittent dict_complex test failures
`test_dict_complex` and `test_dict_numpy_complex` would give occasional test
failures on Python 3.4.  The test was written to depend on the order of values
from `dict.values()`; remove that dependency.

Closes gh-7293.

Good point - how about this version?
 yeh these tests were ripped from the numpy-msgpack impl 

thanks !
 nice!
