ci: don't use dev versions #1635

Job	Run time
build / build	23s
lint / tox	51s
test (macos-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 27s
test (ubuntu-latest, 3.10.13) / tox	2m 52s
test (ubuntu-latest, 3.11.5) / tox	2m 18s
test (ubuntu-latest, 3.12.4) / tox	2m 42s
test (ubuntu-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 58s
test (ubuntu-latest, 3.8.18) / tox	1m 39s
test (ubuntu-latest, 3.9.18) / tox	2m 37s
test (windows-latest, 3.13-dev, --cov-fail-under=100) / tox	3m 26s
attest	5s
check / check	3s
deploy	0s
	20m 21s

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