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What this does
Bump hf datasets version to 4.0.0 at minimum.
HF Datasets v4 introduces some nice features for streaming and some breaking changes with respect to previous changes.
LeRobotDatasets v2.1 was not made compatible with the with the v4 release and we chose to cap the dependency. However, the recent merge of #1412, LeRobotDataset v3 is compatible with the recent versions of hf datasets thus allowing us to bump the version. Now, we can be more up to date with the latest hf datasets features without having to modify any logic in our code.
Tests
Checked that the tests for datasets pass for all v4+ releases (4.0.0, 4.1.0, 4.1.1)