Fix deprecation of use_auth_token in DownloadConfig
This PR fixes an issue with the deprecation of `use_auth_token` in `DownloadConfig` introduced by:
- #5996

```python
In [1]: from datasets import DownloadConfig

In [2]: DownloadConfig(use_auth_token=False)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-41927b449e72> in <module>
----> 1 DownloadConfig(use_auth_token=False)

TypeError: __init__() got an unexpected keyword argument 'use_auth_token'
```

```python
In [1]: from datasets import get_dataset_config_names
In [2]: get_dataset_config_names("squad", use_auth_token=False)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-22-4671992ead50> in <module>
----> 1 get_dataset_config_names("squad", use_auth_token=False)

~/huggingface/datasets/src/datasets/inspect.py in get_dataset_config_names(path, revision, download_config, download_mode, dynamic_modules_path, data_files, **download_kwargs)
    349     ```
    350     """
--> 351     dataset_module = dataset_module_factory(
    352         path,
    353         revision=revision,

~/huggingface/datasets/src/datasets/load.py in dataset_module_factory(path, revision, download_config, download_mode, dynamic_modules_path, data_dir, data_files, **download_kwargs)
   1374     """
   1375     if download_config is None:
-> 1376         download_config = DownloadConfig(**download_kwargs)
   1377     download_mode = DownloadMode(download_mode or DownloadMode.REUSE_DATASET_IF_EXISTS)
   1378     download_config.extract_compressed_file = True

TypeError: __init__() got an unexpected keyword argument 'use_auth_token'
```