Run all tox jobs using Python3

CI(dependabot): Bump codecov/codecov-action from 4 to 5 (#8) #33

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Run time

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Job	Run time
build (3.9, latest_versions)	6m 17s
build (3.10, latest_versions)	5m 35s
build (3.11, latest_versions)	5m 10s
build (3.12, latest_versions)	7m 8s
build (3.9, min_versions)	5m 20s
	29m 30s