Bump sphinx from 7.4.7 to 8.1.3 #1662

Job	Run time
Documentation Build (mock examples)	2m 20s
Code style	1m 47s
Update CHANGELOG for new tag	0s
Documentation style	16s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.10)	21s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.11)	21s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.12)	30s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.13)	36s
Build wheelhouse for latest Python versions (windows-latest, 3.10)	2m 20s
Build wheelhouse for latest Python versions (windows-latest, 3.11)	1m 42s
Build wheelhouse for latest Python versions (windows-latest, 3.12)	1m 21s
Build wheelhouse for latest Python versions (windows-latest, 3.13)	1m 58s
Server checks	0s
Tests Python 3.10, ubuntu-latest	55s
Tests Python 3.11, ubuntu-latest	49s
Tests Python 3.12, ubuntu-latest	1m 14s
Tests Python 3.13, ubuntu-latest	1m 15s
Tests Python 3.10, windows-latest	1m 44s
Tests Python 3.11, windows-latest	1m 30s
Tests Python 3.12, windows-latest	1m 25s
Tests Python 3.13, windows-latest	2m 34s
Deploy development documentation	0s
Build library	18s
Release	0s
Deploy stable documentation	0s
	25m 16s

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