Tests failing against pip main branch: `install_req_from_line` refactored

https://github.com/pypa/pip/pull/11876 breaks [install_req_from_line usage](https://github.com/jazzband/pip-tools/actions/runs/4534518914/jobs/7989930750) in tests:

```python
TypepeError: install_req_from_line() got an unexpected keyword argument 'options'
```