Update datasets 2.14.3
Update `datasets` dependency to version 2.14.3, instead of 2.14.1 because there were issues. See:
- https://github.com/huggingface/datasets/pull/6094
- https://github.com/huggingface/datasets/pull/6095
- https://github.com/huggingface/datasets/pull/6105
- https://github.com/huggingface/datasets/pull/6107

We are merging this PR into a dedicated branch:
- https://github.com/huggingface/datasets-server/tree/update-datasets-2.14

This way we can merge subsequent required PRs into the same branch to fix the CI. Once the CI is green, we can merge the branch into main

Fix partially #1589.
Fix partially #1550.

Supersede and close #1577. 
Supersede and close #1588. 
Update datasets 2.14.3: Update `datasets` dependency to version 2.14.3, instead of 2.14.1 because there were issues. See:
- https://github.com/huggingface/datasets/pull/6094
- https://github.com/huggingface/datasets/pull/6095
- https://github.com/huggingface/datasets/pull/6105
- https://github.com/huggingface/datasets/pull/6107

We are merging this PR into a dedicated branch:
- https://github.com/huggingface/datasets-server/tree/update-datasets-2.14

This way we can merge subsequent required PRs into the same branch to fix the CI. Once the CI is green, we can merge the branch into main

Fix partially #1589.
Fix partially #1550.

Supersede and close #1577. 
Supersede and close #1588. 