python: Remove a redundant pip install call (#38449)

I confirmed that the pip packages match for:
```sh
pip install python-lsp-server && pip install 'python-lsp-server[all]'
pip install 'python-lsp-server[all]'
```

Originally introduced here:
- https://github.com/zed-industries/zed/pull/20358 

Release Notes:

- N/A
530225a06aPeter Tripp committed on 9/18/2025, 8:40:06 PM· committed by GitHubparent11212b8
1 file changedLine totals unavailable