Timit_asr dataset repeats examples
Hi,

this was fixed by #1995, so you can wait for the next release or install the package directly from the master branch with the following command: 
```bash
pip install git+https://github.com/huggingface/datasets
``` Ty!
Summary

When loading timit_asr dataset on datasets 1.4+, every row in the dataset is the same
Steps to reproduce

As an example, on this code there is the text from the training part:

Code snippet:
```
from datasets import load_dataset, load_metric

timit = load_dataset("timit_asr")
timit['train']['text']
#['Would such an act of refusal be useful?',
# 'Would such an act of refusal be useful?',
# 'Would such an act of refusal be useful?',
# 'Would such an act of refusal be useful?',
# 'Would such an act of refusal be useful?',
# 'Would such an act of refusal be useful?',
```
The same behavior happens for other columns

Expected behavior:

Different info on the actual timit_asr dataset

Actual behavior:

When loading timit_asr dataset on datasets 1.4+, every row in the dataset is the same. I've checked datasets 1.3 and the rows are different
Debug info

    Streamlit version: (get it with $ streamlit version)
    Python version: Python 3.6.12
    Using Conda? PipEnv? PyEnv? Pex? Using pip
    OS version: Centos-release-7-9.2009.1.el7.centos.x86_64

Additional information

You can check the same behavior on https://huggingface.co/datasets/viewer/?dataset=timit_asr