Older datasets throwing safety errors with 2.21.0
### Describe the bug

The dataset loading was throwing some safety errors for this popular dataset `wmt14`. 

[in]:

```
import datasets

# train_data = datasets.load_dataset("wmt14", "de-en", split="train")
train_data = datasets.load_dataset("wmt14", "de-en", split="train")
val_data = datasets.load_dataset("wmt14", "de-en", split="validation[:10%]")
```


[out]:

```
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
[<ipython-input-9-445f0ecc4817>](https://localhost:8080/#) in <cell line: 4>()
      2 
      3 # train_data = datasets.load_dataset("wmt14", "de-en", split="train")
----> 4 train_data = datasets.load_dataset("wmt14", "de-en", split="train")
      5 val_data = datasets.load_dataset("wmt14", "de-en", split="validation[:10%]")

12 frames
[/usr/local/lib/python3.10/dist-packages/huggingface_hub/hf_api.py](https://localhost:8080/#) in __init__(self, **kwargs)
    636         if security is not None:
    637             security = BlobSecurityInfo(
--> 638                 safe=security["safe"], av_scan=security["avScan"], pickle_import_scan=security["pickleImportScan"]
    639             )
    640         self.security = security

KeyError: 'safe'
```


### Steps to reproduce the bug

See above.

### Expected behavior

Dataset properly loaded.

### Environment info

version: 2.21.0