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Move `six` to `optional-dependencies` #1054

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Run time

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Job	Run time
build (ubuntu-latest, 3.9, 9.4)	9m 49s
build (ubuntu-latest, 3.9, latest)	11m 33s
build (ubuntu-latest, 3.13, latest)	10m 47s
build (ubuntu-22.04, 3.7, 9.1)	9m 20s
	41m 29s