update to reflect changes in pymc-bart 0.4.0

[aloctavodia]

• [x] Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• [x] Check the notebook is not excluded from any pre-commit check: https://github.com/pymc-devs/pymc-examples/blob/main/.pre-commit-config.yaml

[review-notebook-app[bot]]

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