Create a tool to help with version support changes

[ni-jfitzger]

Description of issue

Write a tool to help with updating python versions in tox.inis, actions, workflows, anywhere else (a pre-codegen step), so that we don't overlook changes needed when adding / dropping Python version support or end up use stale versions of Python in our

It should probably take in our (previous) earliest supported version and latest supported version as arguments and the version we're adding or dropping.