Packaging updates

[Stoops-ML]

• pass mypy tests
• update python version classifiers: remove 3.5, add 3.10 and 3.11
• add python 3.10 and 3.11 environments to tox
• update dev requirements

[Stoops-ML]

This PR should close #105

[Stoops-ML]

Just realised I didn't update the circleci config file. I'll do another PR once this PR is closed.