Dev: Upgrade to pyinvoke 2.2.0

[hoyes]

pyinvoke 1.7.1 fails with Python 3.11 due to changes to inspect.getargspec in the standard library. This has been fixed in 2.2.0

A smoke test of inv docker.up and inv docker.down are successful and the changelog (https://www.pyinvoke.org/changelog.html) doesn't mention any breaking changes other than the Python version. 2.2.0 supports all currently maintained versions of Python.