Update the getting_started_with_winnow notebook

Summary:

Update the getting_started_with_winnow.ipynb notebook to be compatible with the latest version of Winnow and make sure it can run on Google Colab.

Additional Notes:

The current version fails on Google Colab with:

ImportError                               Traceback (most recent call last)
[/tmp/ipykernel_4389/2835199764.py](https://localhost:8080/#) in <cell line: 0>()
     10 from huggingface_hub import list_repo_files, snapshot_download
     11 
---> 12 from winnow.calibration.calibration_features import (
     13     BeamFeatures,
     14     CalibrationFeatures,

14 frames
[/usr/local/lib/python3.12/dist-packages/numpy/_core/strings.py](https://localhost:8080/#) in <module>
     20 from numpy._core.multiarray import _vec_string
     21 from numpy._core.overrides import array_function_dispatch, set_module
---> 22 from numpy._core.umath import (
     23     _center,
     24     _expandtabs,

ImportError: cannot import name '_center' from 'numpy._core.umath' (/usr/local/lib/python3.12/dist-packages/numpy/_core/umath.py)

Open getting_started_with_winnow.ipynb and reproduce the failure in Google Colab, starting with the installation and import cells around winnow.calibration.calibration_features. Update the notebook for the latest Winnow and compatible dependencies, then run its cells end to end to confirm it completes without the reported NumPy ImportError.