Should update scipy dependency

[rmuller]

I followed the instructions found at this project README file.

Environment:

• Ubuntu 20.04
• pyenv managed Python 3.10.5 (also tried system installed 3.8.10)

1. pip install -e univariate_linear_regression fails

If upgrading scipy (in setup.py) to 1.8.1 (and numpy to 1.22.0) everything went well.

2. pytest --mpl fails

Also pytest needs to be upgraded (see https://stackoverflow.com/questions/69528842) to 7.1.2 to get the pytest working.

All in all, these settings should be used when using python 3.10. Dependencies for other versions should be explicitly documented at the README file.

  install_requires=["jupyter==1.0.0",
                    "matplotlib==3.5.2",
                    "numpy==1.22.0",
                    "pytest==7.1.2",
                    "pytest-mpl==0.16.1",
                    "pytest-mock==3.8.2",
                    "scipy==1.8.1",
                    ],
  )