Revert max_workers for pq validation
revert https://github.com/huggingface/datasets-server/pull/2544 since it made it too slow to process https://huggingface.co/datasets/Major-TOM/Core-S2L2A
Revert max_workers for pq validation: revert https://github.com/huggingface/datasets-server/pull/2544 since it made it too slow to process https://huggingface.co/datasets/Major-TOM/Core-S2L2A