Update notebook to match current version of jupyter-events

[manics]

This runs for me in a local JupyterLab, but JupyterLite (https://jupyter-events.readthedocs.io/en/latest/demo/index.html) fails due to:

import piplite
await piplite.install("jupyter_events")

ValueError: Can't find a pure Python 3 wheel for 'rpds-py>=0.7.1'.
See: https://pyodide.org/en/stable/usage/faq.html#micropip-can-t-find-a-pure-python-wheel
You can use `micropip.install(..., keep_going=True)`to get a list of all packages with missing wheels.

[Zsailer]

LGTM! Thanks, @manics.

We can dive into the piplite issues in a separate PR.