Update for Python 3.8 and later #20

Job	Run time
collateral (docs)	25s
test (3.8, ubuntu-latest)	30s
test (3.8, ubuntu-latest, optional)	39s
test (3.8, macos-latest)	57s
test (3.8, macos-latest, optional)	1m 15s
test (3.8, windows-latest)	1m 11s
test (3.8, windows-latest, optional)	1m 39s
test (3.11, ubuntu-latest)	28s
test (3.11, ubuntu-latest, optional)	43s
test (3.11, macos-latest)	1m 7s
test (3.11, macos-latest, optional)	57s
test (3.11, windows-latest)	2m 4s
test (3.11, windows-latest, optional)	2m 12s
test (3.12, ubuntu-latest)	42s
test (3.12, ubuntu-latest, optional)	50s
test (3.12, macos-latest)	1m 2s
test (3.12, macos-latest, optional)	2m 4s
test (3.12, windows-latest)	2m 0s
test (3.12, windows-latest, optional)	1m 45s
test (3.9, ubuntu-latest)	29s
test (3.10, ubuntu-latest)	40s
test (pypy3.10, ubuntu-latest)	1m 35s
check	1s
release	0s
	25m 15s

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