Run all tox jobs using Python3

Build: Drop support for Python 3.8 #30

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Run time

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Job	Run time
build (3.9, latest_versions)	6m 40s
build (3.10, latest_versions)	2m 55s
build (3.11, latest_versions)	2m 36s
build (3.12, latest_versions)	2m 49s
build (3.9, min_versions)	3m 6s
	18m 6s