Upgrade datasets to fix the issue with common_voice

[severo]

See https://github.com/huggingface/datasets-preview-backend/runs/5690421290?check_suite_focus=true

Upgrading to the next release (next week) should fix the CI and the common_voice dataset viewer

[severo]

(thanks @lhoestq for the diagnostic)

[severo]

Issue reported here by a user: huggingface/datasets#4126

[severo]

Fixed by #209