Add support for Python 3.13 #1623

Job	Run time
lint / tox	49s
build / build	18s
test (macos-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 18s
test (ubuntu-latest, 3.10.13) / tox	2m 31s
test (ubuntu-latest, 3.11.5) / tox	2m 18s
test (ubuntu-latest, 3.12.4) / tox	2m 47s
test (ubuntu-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 52s
test (ubuntu-latest, 3.8.18) / tox	1m 34s
test (ubuntu-latest, 3.9.18) / tox	2m 24s
test (windows-latest, 3.13-dev, --cov-fail-under=100) / tox	3m 1s
attest	0s
check / check	9s
deploy	0s
	19m 1s

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