Deep learning for nlp

See merge request sis/courses/machinelearning-introduction-workshop!53

- plot_confusion_matrix is deprecated
- https://scikit-learn.org/stable/modules/classes.html#module-sklearn.metrics

- split large cells

- split large cells
- remove empty comment

- update sklearn version
- update text for changed code below

Resolve "Add new sklearn feature to classification chapter"

Closes #69

See merge request sis/courses/machinelearning-introduction-workshop!51

# Conflicts:
#   02_classification.ipynb

- fails otherwise (tested on Windows 11)
- clear all outputs

- based on tests after clean install

Update environment to latest versions of Python, sklearn, jupyterlab and tensorflow and make minor changes to notebooks

Neural networks update

See merge request sis/courses/machinelearning-introduction-workshop!38