Bump sphinx from 8.0.2 to 8.1.0 #2013

Job	Run time
tests (3.9, windows-latest)	8m 0s
tests (3.9, ubuntu-latest)	6m 25s
tests (3.10, windows-latest)	14m 8s
tests (3.10, ubuntu-latest)	8m 54s
Style Check	50s
debug	3s
tests (3.11, windows-latest)	9m 22s
tests (3.11, ubuntu-latest)	6m 31s
Retro-compatibility (3.10, windows-latest, 242)	7m 53s
Retro-compatibility (3.10, windows-latest, 241)	5m 41s
Retro-compatibility (3.10, windows-latest, 232)	3m 56s
Retro-compatibility (3.10, windows-latest, 231)	3m 33s
Retro-compatibility (3.10, windows-latest, 222)	3m 23s
Retro-compatibility (3.10, ubuntu-latest, 242)	6m 26s
Retro-compatibility (3.10, ubuntu-latest, 241)	4m 25s
Retro-compatibility (3.10, ubuntu-latest, 232)	2m 51s
Retro-compatibility (3.10, ubuntu-latest, 231)	2m 50s
Retro-compatibility (3.10, ubuntu-latest, 222)	2m 54s
docs / Documentation	5m 19s
docs / Check doc style	17s
examples / Setup	1s
examples / Run Examples (3.10, windows-latest)	9m 42s
examples / Run Examples (3.10, ubuntu-latest)	5m 33s
upload-development-docs	0s
	1h 58m 57s

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