Add support for Python 3.13 #1596

Job	Run time
lint / tox	50s
build / build	18s
test (macos-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 17s
test (ubuntu-latest, 3.10.13) / tox	2m 35s
test (ubuntu-latest, 3.11.5) / tox	2m 23s
test (ubuntu-latest, 3.12.4) / tox	2m 39s
test (ubuntu-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 51s
test (ubuntu-latest, 3.8.18) / tox	1m 41s
test (ubuntu-latest, 3.9.18) / tox	2m 25s
test (windows-latest, 3.13-dev, --cov-fail-under=100) / tox	4m 10s
build / attest	0s
check / check	2s
deploy	0s
	20m 11s

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