Merge pull request #107567 from jiahuif-forks/automated-cherry-pick-o…

…f-#107565-upstream-release-1.23

Automated cherry pick of #107565: upgrade sigs.k8s.io/structured-merge-diff/v4 to v4.2.1

Kubernetes-commit: 3426f6ceaf92ad40de9f381c20d054c8fef10c03

go.mod

@@ -24,5 +24,3 @@ require (
 	k8s.io/kube-openapi v0.0.0-20211115234752-e816edb12b65
 	sigs.k8s.io/structured-merge-diff/v4 v4.2.1 // indirect
 )
-
-replace k8s.io/code-generator => ../code-generator