CI: Jupyter notebook warning (not related to UXsim itself)

[toruseo]

I found that the automated test on Jupyter notebooks by Github Action are raising the following warning. I think this is not related to UXsim itself, but I have to do something in the future.

 =============================== warnings summary ===============================
../../../../../opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/site-packages/jupyter_client/connect.py:22
  /opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/site-packages/jupyter_client/connect.py:22: DeprecationWarning: Jupyter is migrating its paths to use standard platformdirs
  given by the platformdirs library.  To remove this warning and
  see the appropriate new directories, set the environment variable
  `JUPYTER_PLATFORM_DIRS=1` and then run `jupyter --paths`.
  The use of platformdirs will be the default in `jupyter_core` v6
    from jupyter_core.paths import jupyter_data_dir, jupyter_runtime_dir, secure_write

Just for the record