python: make it compatible with python 3.13 #14

Job	Run time
test (ubuntu-latest, 26.3, false)	42s
test (ubuntu-latest, 27.2, false)	34s
test (ubuntu-latest, 28.2, false)	38s
test (ubuntu-latest, 29.4, false)	1m 1s
test (ubuntu-latest, 30.1, false)	46s
test (macos-latest, 28.2, false)	1m 24s
test (macos-latest, 29.4, false)	1m 45s
test (macos-latest, 30.1, false)	1m 47s
test (windows-latest, 26.3, false)	2m 0s
test (windows-latest, 27.2, false)	1m 37s
test (windows-latest, 28.2, false)	1m 6s
test (windows-latest, 29.4, false)	1m 54s
test (windows-latest, 30.1, false)	2m 22s
test (ubuntu-latest, snapshot, true)	33s
test (macos-latest, snapshot, true)	1m 19s
test (windows-latest, snapshot, true)	3m 30s
	22m 58s

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