Upgrade GitHub Actions

[cclauss]

Also, remove redundant settings.

[facelessuser]

While there may be some good things in here, there are a lot of large, opinionated decisions being made about how we should perform our actions in this PR. I would have appreciated a discussion first about the proposed changes as that would have saved you some time.

I don't mind upgrading actions, I also don't mind removing deadsnakes. I'm also not against bumping max-parallel, but I don't think I'm interested in the other changes.

[cclauss]

Why is Python 3.11 not a required test?

[facelessuser]

Originally, I was trying out the "required" tests option. I always forget to update new tests and remove old tests. I don't have non-required tests, so I will remove the "required" settings.

[cclauss]

Added if: matrix.tox-env == 'documents' then install Aspell

[facelessuser]

I guess I am okay with docs and lint as they do appear separate now.

I do need continue-on-error easily configurable. The current setup does not allow this and I consider it a regression.

[facelessuser]

Yeah, as soon as you include one, the tests don't run unless they are all defined, which is why I just define them all.

[facelessuser]

Thanks for your patience, I think everything looks okay now.

@gir-bot lgtm