Test environment updates #962

Job	Run time
Run tests on legacy versions (3.7)	37s
Run linters (flake8)	1m 57s
Run tests on legacy versions (pypy2.7)	22s
Run tests with coverage	1m 7s
Run linters (pydocstyle)	1m 55s
Run tests (3.8)	1m 16s
Run tests on legacy versions (pypy3.9)	37s
Run tests (3.9)	1m 17s
Run linters (mypy)	1m 53s
Run tests (3.10)	1m 20s
Run linters (pylint)	1m 55s
Run tests (3.11)	1m 11s
Run tests (3.12)	2m 32s
	17m 59s

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