[vendor] drop pinned kube-openapi

no longer need to pin kube-openapi, structured-merge-diff/v6 is fully
compatible with k8s 1.34 apimachinery

Author: jrvaldes

go.mod

@@ -8,9 +8,6 @@ replace (
 	// fix CVE-2025-30204 transitive deps still using older v4. Remove once `go mod graph` shows only 4.5.2 or higher
 	github.com/golang-jwt/jwt/v4 => github.com/golang-jwt/jwt/v4 v4.5.2
 	github.com/golang-jwt/jwt/v5 => github.com/golang-jwt/jwt/v5 v5.2.2
-
-	// pin kube-openapi to pre structured-merge-diff/v6 to resolve apimachinery type mismatch
-	k8s.io/kube-openapi => k8s.io/kube-openapi v0.0.0-20250628140032-d90c4fd18f59
 )
 
 require (
@@ -157,6 +154,5 @@ require (
 	sigs.k8s.io/kustomize/api v0.19.0 // indirect
 	sigs.k8s.io/kustomize/kyaml v0.19.0 // indirect
 	sigs.k8s.io/randfill v1.0.0 // indirect
-	sigs.k8s.io/structured-merge-diff/v4 v4.7.0 // indirect
 	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
 )