Motivation
It's likely that we can use lower versions of all dependencies. It will take a bit of trial and error to see how far we can push the envelope. But it should help make usethis more compatible with older projects.

Summary of desired enhancement
Decrease the lower bound on all (core) dependencies, not necessarily as far as possible but perhaps back to around the beginning of 2021, before 3.10 was released. Basically we just want to try it and see if the tests pass - if not, then we can gradually increase by minor version increments.