Update `datasets` to 2.16.1 (#2231)
* update to 2.16.1
* pass trust_remote_code
* don't use parquet export in `datasets`
* update hfh to 0.20.1
* HF_DATASETS_TRUST_REMOTE_CODE=0
* style
* minor
* update tests
* missing line
* add comment
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Co-authored-by: Sylvain Lesage <sylvain.lesage@huggingface.co>
