Run all tox jobs using Python3

CI(dependabot): Bump actions/checkout from 5 to 6 #42

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Run time

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Job	Run time
build (3.9, min_versions)	3m 2s
build (3.10, latest_versions)	2m 59s
build (3.9, latest_versions)	3m 6s
build (3.12, latest_versions)	3m 7s
build (3.11, latest_versions)	2m 49s
	15m 3s