Run all tox jobs using Python3

CI(dependabot): Bump actions/setup-node from 4 to 6 #39

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Run time

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Job	Run time
build (3.11, latest_versions)	3m 34s
build (3.10, latest_versions)	3m 33s
build (3.9, min_versions)	3m 26s
build (3.12, latest_versions)	3m 16s
build (3.9, latest_versions)	3m 31s
	17m 20s