start testing on 3.13 (#1277) #2614

Job	Run time
check_release	49s
Make SDist	23s
build (ubuntu-latest, 3.9)	53s
test_docs	44s
build (ubuntu-latest, 3.13)	51s
Test Lint	54s
build (windows-latest, 3.9)	37s
Test Minimum Versions	50s
Test Prereleases	54s
build (windows-latest, 3.13)	40s
build (macos-latest, 3.9)	54s
test_without_debugpy (ubuntu-latest, 3.9)	55s
link_check	53s
build (macos-latest, 3.13)	53s
build (ubuntu-latest, pypy-3.9)	53s
build (macos-latest, 3.10)	41s
build (ubuntu-latest, 3.11)	53s
build (ubuntu-latest, 3.12)	53s
Install from SDist and Test	13s
coverage	1s
tests_check	1s
	14m 45s

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