Fix hub cache libraries
Follows the changes in https://github.com/huggingface/datasets-server/pull/2454

The `dataset-hub-cache` should have `libraries` as a list of strings, not a list of CompatibleLibrary objects
Fix hub cache libraries: Follows the changes in https://github.com/huggingface/datasets-server/pull/2454

The `dataset-hub-cache` should have `libraries` as a list of strings, not a list of CompatibleLibrary objects