Fix dependency on dill version
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2022-05-25T10:55:35Z
https://github.com/huggingface/datasets/pull/4397#issuecomment-1137096720
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2022-05-25T14:02:51Z
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We had to make a hotfix by pinning dill:
- #4380

because from version 0.3.5, our custom `save_function` pickling function was raising an exception:
- #4379

This PR fixes this by implementing our custom `save_function` depending on the version of dill.

CC: @anivegesana 

This PR needs first being merged:
- [x] #4384
  - so that a circular import is fixed

It is also convenient to merge first:
- [x] #4385