Bump sphinx from 8.0.2 to 8.1.3 #2020

Job	Run time
debug	4s
Style Check	45s
Retro-compatibility (3.10, windows-latest, 242)	7m 49s
tests (3.9, windows-latest)	9m 34s
Retro-compatibility (3.10, windows-latest, 241)	5m 47s
tests (3.9, ubuntu-latest)	6m 50s
Retro-compatibility (3.10, windows-latest, 232)	3m 59s
tests (3.10, windows-latest)	14m 35s
Retro-compatibility (3.10, windows-latest, 231)	4m 25s
tests (3.10, ubuntu-latest)	7m 41s
Retro-compatibility (3.10, windows-latest, 222)	3m 31s
tests (3.11, windows-latest)	9m 24s
Retro-compatibility (3.10, ubuntu-latest, 242)	6m 39s
tests (3.11, ubuntu-latest)	6m 46s
Retro-compatibility (3.10, ubuntu-latest, 241)	4m 26s
Retro-compatibility (3.10, ubuntu-latest, 232)	3m 8s
Retro-compatibility (3.10, ubuntu-latest, 231)	3m 2s
Retro-compatibility (3.10, ubuntu-latest, 222)	2m 48s
docs / Documentation	6m 9s
docs / Check doc style	16s
examples / Setup	1s
examples / Run Examples (3.10, windows-latest)	9m 55s
examples / Run Examples (3.10, ubuntu-latest)	4m 44s
upload-development-docs	0s
	2h 2m 18s

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