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Bump actions/setup-python #973

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Run time

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Job	Run time
build (ubuntu-latest, 3.9, 9.4)	9m 26s
build (ubuntu-22.04, 3.7, 9.1)	1m 4s
build (ubuntu-latest, 3.9, latest)	9m 48s
build (ubuntu-latest, 3.13, latest)	9m 18s
	29m 36s