update docs-publish target to v2.4 (kubernetes-sigs#2513)

Author: kishorj

Makefile

@@ -101,7 +101,7 @@ docs-preview: docs-dependencies
 
 # publish the versioned docs using mkdocs mike util
 docs-publish: docs-dependencies
-pipenv run mike deploy v2.3 latest -p --update-aliases
+pipenv run mike deploy v2.4 latest -p --update-aliases
 
 # install dependencies needed to preview and publish docs
 docs-dependencies: