Based on the conversation in issue #100.

This package template supports Python 3.9, 3.10, and also 3.11 virtual environments on Linux, Mac, and Windows platforms. Unit testing is currently orchestrated using tox for Python 3.9 and 3.10, we haven’t added 3.11 yet. However, considering PR #99 we’re expanding our CI test matrix across different Python versions and platforms, it doesn’t make sense to run tests against multiple Python versions locally and in CI.

And so we’re now removing tox and run unit tests locally in whichever Python venv the user chooses to work, and without expecting the user to have other Python versions available.