Parametrize twice rather than using itertools #714

Job	Run time
lint (3.10, black)	14s
lint (3.10, flake8)	18s
test (ubuntu-latest, 3.8, true, true)	1m 2s
test (ubuntu-latest, 3.9, true, true)	2m 6s
lint (3.10, mypy)	29s
test (ubuntu-latest, 3.10, true, true)	45s
test (ubuntu-latest, 3.11, true, true)	1m 53s
test (ubuntu-latest, 3.12, true, true)	52s
test (ubuntu-latest, pypy-3.9, true, true)	1m 16s
test (macos-latest, 3.10, true)	52s
test (ubuntu-20.04, 3.10, false, false)	30s
test (ubuntu-20.04, 3.10, false, true)	41s
test (ubuntu-20.04, 3.10, false, false, true)	53s
test (windows-latest, 3.10)	59s
deploy	0s
	12m 50s

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