Update sphinx requirement from <7.0.0 to <9.0.0 #322

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Job	Run time
build (3.8.15)	34s
build (3.9.16)	34s
build (3.10.9)	33s
build (3.11.1)	30s
build (3.11.5)	54s
build (3.12)	31s
	3m 36s