DOC: update link to v4 docs #568

Job	Run time
mypy	3m 22s
py3.13 \| macos \| unit tests	7m 54s
py3.13 \| macos \| integration tests	16m 50s
py3.13 \| ubuntu \| unit tests	13m 44s
py3.13 \| ubuntu \| integration tests	17m 13s
py3.13 \| windows \| unit tests	20m 42s
py3.13 \| windows \| integration tests	42m 11s
py3.10 \| ubuntu \| unit tests	13m 14s
py3.10 \| ubuntu \| integration tests	16m 57s
py3.11 \| ubuntu \| unit tests	13m 11s
py3.12 \| ubuntu \| unit tests	13m 58s
merge-test-artifacts	4s
	2h 59m 20s

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