Fix: RemovedInSphinx80Warning #591

Job	Run time
test-development-versions-deps	1m 5s
test-no-erdantic-version	36s
test-stable-versions (3.7, 20, 40)	1m 26s
test-latest-version	1m 15s
test-stable-versions (3.8, 20, 45)	1m 18s
test-stable-versions (3.9, 20, 45)	2m 37s
test-linter	31s
test-stable-versions (3.9, 20, 53)	1m 21s
test-stable-versions (3.10, 20, 62)	1m 17s
test-stable-versions (3.10, 20, 70)	1m 12s
test-stable-versions (3.11, 20, 70)	1m 13s
test-stable-versions (3.11, 21, 70)	1m 14s
	15m 5s

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