api: fix ValidatingAdmissionPolicyList json tag

This change make api-server not omity the field `item` of
ValidatingAdmissionPolicyList when ValidatingAdmissionPolicy is empty.
So kubetl will print ValidatingAdmissionPolicyList correctly when ValidatingAdmissionPolicy is empty.

Signed-off-by: xyz-li <hui0787411@163.com>

api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1_openapi.json

@@ -622,6 +622,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
@@ -699,6 +702,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {

api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1alpha1_openapi.json

@@ -350,6 +350,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
@@ -427,6 +430,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {

api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1beta1_openapi.json

@@ -351,6 +351,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
@@ -428,6 +431,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {