[6.12.z] Bump sphinx from 7.2.5 to 7.2.6 (#12609)

Bump sphinx from 7.2.5 to 7.2.6 (#12607)

(cherry picked from commit 3907ad1)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements-optional.txt

@@ -5,7 +5,7 @@ redis==5.0.0
 pre-commit==3.4.0
 
 # For generating documentation.
-sphinx==7.2.5
+sphinx==7.2.6
 sphinx-autoapi==2.1.1
 
 # For 'manage' interactive shell