Run all tox jobs using Python3

CI(dependabot): Bump actions/upload-artifact from 4 to 5 (#71) #178

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Run time

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Job	Run time
build (3.12, latest_versions)	3m 53s
build (3.11, latest_versions)	4m 37s
build (3.10, latest_versions)	4m 46s
build (3.9, latest_versions)	3m 57s
build (3.9, min_versions)	2m 54s
	20m 7s