Fix: RemovedInSphinx80Warning #606

Job	Run time
test-no-erdantic-version	1m 6s
test-stable-versions (3.8, 20, 45)	1m 53s
test-linter	9s
test-latest-version	1m 34s
test-stable-versions (3.9, 20, 45)	1m 19s
test-development-versions-deps	1m 37s
test-stable-versions (3.9, 20, 53)	1m 20s
test-stable-versions (3.10, 20, 62)	1m 13s
test-stable-versions (3.10, 20, 70)	1m 55s
test-stable-versions (3.11, 20, 70)	1m 19s
test-stable-versions (3.11, 21, 71)	1m 22s
test-stable-versions (3.11, 22, 71)	1m 17s
test-stable-versions (3.11, 23, 71)	1m 7s
test-stable-versions (3.11, 24, 72)	1m 11s
test-stable-versions (3.12, 25, 72)	1m 17s
	19m 39s

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