Run all tox jobs using Python3

CI(dependabot): Bump actions/checkout from 5 to 6 #181

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Run time

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Job	Run time
build (3.10, latest_versions)	2m 32s
build (3.9, latest_versions)	3m 20s
build (3.11, latest_versions)	2m 15s
build (3.12, latest_versions)	2m 25s
build (3.9, min_versions)	2m 44s
	13m 16s