Poetry: bump Sphinx to 7.3.7 #765

Job	Run time
check	16s
Ubuntu / 3.12 regression tests	52s
check_docs	41s
Ubuntu / 3.8 unit tests	1m 10s
MacOS / 3.12 regression tests	1m 14s
build_docs	3m 30s
Ubuntu / 3.9 unit tests	1m 14s
Windows / 3.12 regression tests	3m 8s
Ubuntu / 3.10 unit tests	1m 15s
Ubuntu / 3.8 regression tests	6m 22s
Ubuntu / 3.11 unit tests	1m 12s
Ubuntu / 3.10 regression tests	51s
Ubuntu / 3.12 unit tests	1m 14s
Ubuntu / 3.11 regression tests	49s
Ubuntu / 3.13.0-alpha - 3.13 unit tests	1m 23s
Ubuntu / 3.13.0-alpha - 3.13 regression tests	1m 2s
Ubuntu / pypy-3.9 unit tests	2m 3s
Ubuntu / pypy-3.9 regression tests	1m 23s
MacOS / 3.8 unit tests	1m 9s
Ubuntu / 3.12 regression tests (docutils)	1m 54s
MacOS / 3.9 unit tests	38s
Ubuntu / 3.12 regression tests (Sphinx)	12m 22s
MacOS / 3.10 unit tests	37s
Ubuntu / 3.9 regression tests (Sphinx)	1m 56s
MacOS / 3.11 unit tests	34s
MacOS / 3.12 unit tests	44s
MacOS / 3.13.0-alpha - 3.13 unit tests	1m 3s
MacOS / pypy-3.9 unit tests	1m 22s
Windows / 3.8 unit tests	2m 43s
Windows / 3.9 unit tests	1m 42s
Windows / 3.10 unit tests	2m 9s
Windows / 3.11 unit tests	1m 48s
Windows / 3.12 unit tests	1m 54s
Windows / 3.13.0-alpha - 3.13 unit tests	2m 46s
Windows / pypy-3.9 unit tests	4m 56s
Ubuntu / 3.12 unit tests (Sphinx)	5m 44s
Ubuntu / 3.9 unit tests (Sphinx)	1m 5s
Update docs versions JSON	8s
check-tag	0s
publish-release	0s
publish-develop	0s
	1h 16m 53s

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