Update space_saving.pyx

[TomAugspurger]

  /Users/taugspurger/Envs/dask-dev/lib/python3.7/site-packages/crick/__init__.py:4: DeprecationWarning: `np.object` is a deprecated alias for the builtin `object`. Use `object` by
itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.object_` here.
    from .space_saving import SpaceSaving

np.object is a deprecated alias for object in NumPy 1.20

[jcrist]

Thanks Tom! I haven't touched this code in forever, didn't know it was still being used anywhere. Out of curiousity, where was this being used that led you to find this?

[TomAugspurger]

It's used via dask's CI :) Would you prefer to just deprecate using crick?

https://github.com/dask/dask/blob/56d0d1be849cba4f7ea58ae47bfa76a594dc6c9b/continuous_integration/environment-3.8-dev.yaml#L34

[jcrist]

Apologies for the delay here, this slipped through the cracks. The code still works, I'd forgotten that we ever got around to using it in dask. Thanks for the fix!