[6.15.z] Bump sphinx from 7.4.5 to 7.4.6 (#15704)

requirements-optional.txt

@@ -5,7 +5,7 @@ redis==5.0.7
 pre-commit==3.7.1
 
 # For generating documentation.
-sphinx==7.4.5
+sphinx==7.4.6
 sphinx-autoapi==3.1.2
 
 # For 'manage' interactive shell