Add support for Python 3.13 #1587

Job	Run time
build / build	18s
lint / tox	56s
test (macos-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 19s
test (ubuntu-latest, 3.10.13) / tox	2m 36s
test (ubuntu-latest, 3.11.5) / tox	2m 28s
test (ubuntu-latest, 3.12.4) / tox	2m 45s
test (ubuntu-latest, 3.8.18) / tox	1m 38s
test (ubuntu-latest, 3.13-dev, --cov-fail-under=100) / tox	1m 57s
test (ubuntu-latest, 3.9.18) / tox	2m 22s
test (windows-latest, 3.13-dev, --cov-fail-under=100) / tox	3m 38s
build / attest	0s
check / check	3s
deploy	0s
	20m 0s

Provide feedback