Run all tox jobs using Python3

CI(dependabot): Bump actions/checkout from 4 to 5 #34

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Run time

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Job	Run time
build (3.9, latest_versions)	4m 44s
build (3.12, latest_versions)	3m 19s
build (3.9, min_versions)	3m 11s
build (3.10, latest_versions)	4m 5s
build (3.11, latest_versions)	3m 48s
	19m 7s