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We run a lot of tests in CI for such a small project, and in the past each tox environment has been run in a separate GitHub Actions job, but we don't really need to do that. The reason we've been splitting them up that way is to make it clear at a glance what configurations are failing when a CI run fails, but in practice we've never really had a failing workflow where we needed to look at all the different failing tox runs to understand the problem; looking at one failure is generally enough.
So, in this PR, I'm consolidating the GHA jobs into one per Python version which will run all the tox environments for that Python version. I'm also enabling the persistent pip package cache. These changes cut down a bit on the amount of setup work done by GHA, and they should also reduce the load we place on PyPI.