The viewer raises PermissionError after updating datasets to 3.0.1

[albertvillanova]

As reported by @lhoestq, the viewer raises PermissionError after updating datasets to 3.0.1:

• Update datasets to 3.0.1 #3071

Error code:   RetryableConfigNamesError
Exception:    PermissionError
Message:      [Errno 13] Permission denied: '/.cache'
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/dataset/config_names.py", line 66, in compute_config_names_response
                  config_names = get_dataset_config_names(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/inspect.py", line 164, in get_dataset_config_names
                  dataset_module = dataset_module_factory(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/load.py", line 1671, in dataset_module_factory
                  raise e1 from None
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/load.py", line 1640, in dataset_module_factory
                  return HubDatasetModuleFactoryWithoutScript(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/load.py", line 1007, in get_module
                  dataset_readme_path = cached_path(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/utils/file_utils.py", line 182, in cached_path
                  output_path = huggingface_hub.HfApi(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/huggingface_hub/utils/_validators.py", line 114, in _inner_fn
                  return fn(*args, **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/huggingface_hub/hf_api.py", line 5280, in hf_hub_download
                  return hf_hub_download(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/huggingface_hub/utils/_deprecation.py", line 101, in inner_f
                  return f(*args, **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/huggingface_hub/utils/_validators.py", line 114, in _inner_fn
                  return fn(*args, **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/huggingface_hub/file_download.py", line 1240, in hf_hub_download
                  return _hf_hub_download_to_cache_dir(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/huggingface_hub/file_download.py", line 1357, in _hf_hub_download_to_cache_dir
                  os.makedirs(os.path.dirname(blob_path), exist_ok=True)
                File "/usr/local/lib/python3.9/os.py", line 215, in makedirs
                  makedirs(head, exist_ok=exist_ok)
                File "/usr/local/lib/python3.9/os.py", line 215, in makedirs
                  makedirs(head, exist_ok=exist_ok)
                File "/usr/local/lib/python3.9/os.py", line 215, in makedirs
                  makedirs(head, exist_ok=exist_ok)
                [Previous line repeated 1 more time]
                File "/usr/local/lib/python3.9/os.py", line 225, in makedirs
                  mkdir(name, mode)
              PermissionError: [Errno 13] Permission denied: '/.cache'