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ci: use `pytest` & bump `py3.11` #53

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Run time

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Job	Run time
pytest (ubuntu-22.04, 3.8)	24s
pytest (ubuntu-22.04, 3.11)	26s
pytest (macOS-13, 3.8)	48s
pytest (macOS-13, 3.11)	58s
pytest (windows-2022, 3.8)	1m 16s
pytest (windows-2022, 3.11)	1m 18s
	5m 10s