Test new Python and pytest versions, drop Python3.7 and pytest 5

[danielhollas]

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[danielhollas]

@The-Compiler friendly ping if you could approve the workflow (and merge if things work out alright?)

[danielhollas]

@The-Compiler thank you! 🙏 I've excluded more failing configurations, fingers crossed that we will be all in the green now.

[The-Compiler]

Thanks! Looks like you should exclude pypy 3.8 and 3.9 as well. @jpvanhal any objections to me merging this afterwards?

IMHO we should just drop support for EOL Python versions entirely, but that can also happen outside of this PR.

[danielhollas]

IMHO we should just drop support for EOL Python versions entirely, but that can also happen outside of this PR.

Yeah, I wasn't sure what the policy here is so I only dropped the stuff that wouldn't work in CI anymore.

[The-Compiler]

Looks like everything looks fine now, thanks again for the efforts! Will wait a few days to see if the maintainers respond, and if not, I'm fine with merging this.

[jpvanhal]

LGTM!