Bump sphinx from 5.3.0 to 7.1.2 #1749

Job	Run time
GPU Tests	20s
python 3.9 - Lint	1m 31s
python 3.9 - Type check	1m 59s
python 3.9 - Build	1m 28s
python 3.9 - Style	22s
python 3.9 - Docs	1m 30s
python 3.9 - Test	25s
python 3.9 - Datasets integration	23s
python 3.9 - PyTorch integration	1m 0s
python 3.9 - Transformers integration	1m 53s
python 3.9 - FairScale integration	57s
python 3.9 - W&B integration	1m 31s
python 3.9 - Beaker integration	27s
python 3.9 - Flax integration	1m 37s
python 3.9 - GS integration	33s
python 3.9 - Example - train_lm	1m 42s
python 3.8 - Test	29s
python 3.10 - Test	29s
Release	0s
	18m 36s

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