Update net-gateway-api nightly (knative#14158)

bumping knative.dev/net-gateway-api 0627098...570bdad:
  > 570bdad Do not bump sigs.k8s.io/gateway-api via dependabot (# 504)
  > c05c289 Bump sigs.k8s.io/gateway-api from 0.6.0 to 0.7.1 (# 503)
  > 28da822 Bump actions/setup-go from 3 to 4 (# 500)
  > 25216be Bump go.uber.org/zap from 1.19.1 to 1.24.0 (# 502)
  > 1be5dcf Bump rtCamp/action-slack-notify from 2.1.0 to 2.2.0 (# 501)
  > 88d4f64 drop istio gatewayclass - istio provides this (# 499)
  > 0108702 Add dependabot and auto update deps (# 498)
  > 5dbb7e3 Update community files (# 497)
  > 9cc39bf upgrade to latest dependencies (# 496)

Signed-off-by: Knative Automation <automation@knative.team>

third_party/gateway-api-latest/istio-gateway.yaml

@@ -22,7 +22,7 @@ metadata:
   labels:
     app.kubernetes.io/component: net-gateway-api
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20230705-0627098f"
+    app.kubernetes.io/version: "20230712-570bdad6"
     experimental.istio.io/disable-gateway-port-translation: "true"
 spec:
   type: ClusterIP
@@ -100,25 +100,3 @@ spec:
           from: All
 
 ---
-# Copyright 2021 The Knative Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-apiVersion: gateway.networking.k8s.io/v1beta1
-kind: GatewayClass
-metadata:
-  name: istio
-spec:
-  controllerName: istio.io/gateway-controller
-
----

third_party/gateway-api-latest/net-gateway-api.yaml

@@ -5210,7 +5210,7 @@ metadata:
     networking.knative.dev/ingress-provider: net-gateway-api
     app.kubernetes.io/component: net-gateway-api
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20230705-0627098f"
+    app.kubernetes.io/version: "20230712-570bdad6"
 aggregationRule:
   clusterRoleSelectors:
     - matchLabels:
@@ -5226,7 +5226,7 @@ metadata:
     networking.knative.dev/ingress-provider: net-gateway-api
     app.kubernetes.io/component: net-gateway-api
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20230705-0627098f"
+    app.kubernetes.io/version: "20230712-570bdad6"
 rules:
   - apiGroups: ["gateway.networking.k8s.io"]
     resources: ["httproutes", "referencegrants", "referencepolicies"]
@@ -5259,7 +5259,7 @@ metadata:
     networking.knative.dev/ingress-provider: net-gateway-api
     app.kubernetes.io/component: net-gateway-api
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20230705-0627098f"
+    app.kubernetes.io/version: "20230712-570bdad6"
 data:
   _example: |
     ################################
@@ -5313,7 +5313,7 @@ metadata:
   labels:
     networking.knative.dev/ingress-provider: net-gateway-api
     app.kubernetes.io/component: net-gateway-api
-    app.kubernetes.io/version: "20230705-0627098f"
+    app.kubernetes.io/version: "20230712-570bdad6"
     app.kubernetes.io/name: knative-serving
 spec:
   replicas: 1
@@ -5340,7 +5340,7 @@ spec:
         - name: controller
           # This is the Go import path for the binary that is containerized
           # and substituted here.
-          image: gcr.io/knative-nightly/knative.dev/net-gateway-api/cmd/controller@sha256:fdaae3f7031cb867ef760f5973e4c9ad64755d67b3c1095955c15c3ceb401b7e
+          image: gcr.io/knative-nightly/knative.dev/net-gateway-api/cmd/controller@sha256:c1a80171520d9f61bcb21984344b7c52d2fe6c5667dd6984e2fa1836a07ab92f
           resources:
             requests:
               cpu: 100m