Emotion dataset cannot be downloaded
### Describe the bug

The emotion dataset gives a FileNotFoundError. The full error is: `FileNotFoundError: Couldn't find file at https://www.dropbox.com/s/1pzkadrvffbqw6o/train.txt?dl=1`.

It was working yesterday (December 7, 2022), but stopped working today (December 8, 2022).

### Steps to reproduce the bug

```python
from datasets import load_dataset
dataset = load_dataset("emotion")
```

### Expected behavior

The dataset should load properly.

### Environment info

- `datasets` version: 2.7.1
- Platform: Windows-10-10.0.19045-SP0
- Python version: 3.9.13
- PyArrow version: 10.0.1
- Pandas version: 1.5.1