Bump sphinx from 7.2.6 to 8.1.3 in /docs #595

Job	Run time
publish-on-pypi	2m 32s
build-on-ubuntu / build	3m 21s
build-on-windows / build	2m 27s
build-installer-on-windows / build	2m 28s
build-on-macos / build	1s
publish-on-github	0s
	10m 49s

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