Bump sphinx from 8.0.2 to 8.1.3 in /core #6880

Job	Run time
Check towncrier / Towncrier Checks	38s
Pre-commit checks / Pre-commit Checks	1m 6s
Package Toga (cocoa) / Create Python Package	20s
Package Toga (core) / Create Python Package	16s
Package Toga (android) / Create Python Package	25s
Package Toga (demo) / Create Python Package	25s
Package Toga (dummy) / Create Python Package	25s
Package Toga (gtk) / Create Python Package	25s
Package Toga (iOS) / Create Python Package	18s
Package Toga (textual) / Create Python Package	14s
Package Toga (toga) / Create Python Package	24s
Package Toga (web) / Create Python Package	26s
Package Toga (winforms) / Create Python Package	24s
Test core (macos-latest, 3.9)	45s
Test core (macos-latest, 3.10)	43s
Test core (macos-latest, 3.11)	42s
Test core (macos-latest, 3.12)	43s
Test core (macos-latest, 3.13)	1m 20s
Test core (ubuntu-latest, 3.9)	48s
Test core (ubuntu-latest, 3.10)	1m 0s
Test core (ubuntu-latest, 3.11)	58s
Test core (ubuntu-latest, 3.12)	57s
Test core (ubuntu-latest, 3.13)	1m 16s
Test core (windows-latest, 3.9)	1m 23s
Test core (windows-latest, 3.10)	1m 26s
Test core (windows-latest, 3.11)	1m 34s
Test core (windows-latest, 3.12)	1m 41s
Test core (windows-latest, 3.13)	2m 30s
Coverage	31s
Testbed (macOS-x86_64)	4m 25s
Testbed (macOS-arm64)	3m 19s
Testbed (windows)	5m 42s
Testbed (linux-x11)	2m 59s
Testbed (linux-wayland)	3m 37s
Testbed (android)	8m 19s
Testbed (iOS)	9m 14s
Testbed (textual-linux)	49s
Testbed (textual-macOS)	55s
Testbed (textual-windows)	1m 47s
	1h 5m 9s

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