Regression Example: Boston should be deprecated

[Jlaventall]

https://github.com/mljar/mljar-examples/blob/master/House_price_regression/House_price_regression.ipynb

based on sci-kit learn's own documentation, the Boston housing prices data set has some issues and should not be used:
https://scikit-learn.org/stable/modules/generated/sklearn.datasets.load_boston.html

recommend adding
from sklearn.datasets import fetch_openml
and
housing = fetch_openml(name="house_prices", as_frame=True)