update dependencies (#6267)

Signed-off-by: hongming <coder.scala@gmail.com>
(cherry picked from commit cfebd96a1f)

vendor/k8s.io/apiserver/pkg/util/webhook/validation.go

@@ -23,8 +23,18 @@ import (
 
 	"k8s.io/apimachinery/pkg/util/validation"
 	"k8s.io/apimachinery/pkg/util/validation/field"
+	"k8s.io/client-go/transport"
 )
 
+func ValidateCABundle(fldPath *field.Path, caBundle []byte) field.ErrorList {
+	var allErrors field.ErrorList
+	_, err := transport.TLSConfigFor(&transport.Config{TLS: transport.TLSConfig{CAData: caBundle}})
+	if err != nil {
+		allErrors = append(allErrors, field.Invalid(fldPath, caBundle, err.Error()))
+	}
+	return allErrors
+}
+
 // ValidateWebhookURL validates webhook's URL.
 func ValidateWebhookURL(fldPath *field.Path, URL string, forceHttps bool) field.ErrorList {
 	var allErrors field.ErrorList