Update k8s dependency version to 1.21

Signed-off-by: xinyanwu409 <wxinyan@vmware>

vendor/k8s.io/api/apps/v1/zz_generated.deepcopy.go

@@ -544,6 +544,11 @@ func (in *RollingUpdateDaemonSet) DeepCopyInto(out *RollingUpdateDaemonSet) {
 		*out = new(intstr.IntOrString)
 		**out = **in
 	}
+	if in.MaxSurge != nil {
+		in, out := &in.MaxSurge, &out.MaxSurge
+		*out = new(intstr.IntOrString)
+		**out = **in
+	}
 	return
 }