Support Python 3.13 #71

Job	Run time
test (macos-latest, 3.9, py39)	18s
test (macos-latest, 3.10, py310)	17s
test (macos-latest, 3.11, py311)	23s
test (macos-latest, 3.12, py312)	17s
test (macos-latest, 3.13, py313)	19s
test (macos-latest, pypy3.9, pypy39)	41s
test (macos-latest, pypy3.10, pypy310)	39s
test (windows-latest, 3.9, py39)	46s
test (windows-latest, 3.10, py310)	54s
test (windows-latest, 3.11, py311)	37s
test (windows-latest, 3.12, py312)	56s
test (windows-latest, 3.13, py313)	1m 26s
test (windows-latest, pypy3.9, pypy39)	1m 57s
test (windows-latest, pypy3.10, pypy310)	1m 58s
test (ubuntu-latest, 3.9, py39)	17s
test (ubuntu-latest, 3.10, py310)	17s
test (ubuntu-latest, 3.11, py311)	18s
test (ubuntu-latest, 3.12, py312)	21s
test (ubuntu-latest, 3.13, py313)	21s
test (ubuntu-latest, pypy3.9, pypy39)	37s
test (ubuntu-latest, pypy3.10, pypy310)	33s
test (ubuntu-latest, 3.9, codestyle)	13s
test (ubuntu-latest, 3.9, lint)	14s
test (ubuntu-latest, 3.9, typecheck)	17s
	14m 56s

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