update mirror for RT dataset
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Thanks for adding this mirror link :)

Could you run the following command to update the json file `dataset_infos.json` used to verify the integrity of the downloaded file ?

```
nlp-cli test ./datasets/rotten_tomatoes --save_infos --ignore_verifications
``` done! @lhoestq  the build_doc CI fail comes from master and has been fixed on master done @thomwolf @lhoestq 
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