Run all tox jobs using python3

Merge pull request #16 from BlueBrain/update-tox #59

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Run time

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Job	Run time
build (3.8)	1m 24s
build (3.9)	46s
build (3.10)	45s
build (3.11)	1m 27s
build (3.12)	49s
	5m 11s