py38 compat #414

Job	Run time
lint / tox	48s
build / build	24s
test (ubuntu-latest, 3.11.5) / tox	2m 20s
test (macos-latest, 3.12.0, --cov-fail-under=100) / tox	2m 17s
test (ubuntu-latest, 3.10.13) / tox	2m 32s
test (ubuntu-latest, 3.12.0, --cov-fail-under=100) / tox	2m 43s
test (ubuntu-latest, 3.8.18) / tox	1m 36s
test (ubuntu-latest, 3.9.18) / tox	2m 26s
test (windows-latest, 3.12.0, --cov-fail-under=100) / tox	3m 11s
attest	10s
check / check	6s
deploy	0s
	18m 33s

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