 SyntaxWarning: invalid escape sequence

Hi there, hope you are doing well.

Every time Django starts I get this warning printed out to the console:

```
/venv/lib/python3.13/site-packages/taggit_selectize/widgets.py:38: SyntaxWarning: invalid escape sequence '\s'
  js = u"""
```

That's with `taggit-selectize==2.11.0` and `django==5.1.2`.

Do you think there might be an easy solution to this issue? 