Merge pull request #523 from vespa-engine/renovate/sphinx-7.x

Update dependency sphinx to v7 MERGEOK

Author: kkraune

docs/sphinx/source/requirements.txt

@@ -1,5 +1,5 @@
 .[full]
-sphinx<4.1   # https://github.com/sphinx-doc/sphinx/issues/9458
+sphinx<7.2   # https://github.com/sphinx-doc/sphinx/issues/9458
 ipykernel
 nbsphinx
 sphinx-rtd-theme>=0.5.0