Update gateway api provider to v1alpha2

Co-authored-by: Tom Moulard <tom.moulard@traefik.io>

pkg/provider/kubernetes/gateway/fixtures/httproute/with_protocol_https.yml

@@ -11,45 +11,44 @@ data:
 
 ---
 kind: GatewayClass
-apiVersion: networking.x-k8s.io/v1alpha1
+apiVersion: gateway.networking.k8s.io/v1alpha2
 metadata:
   name: my-gateway-class
 spec:
-  controller: traefik.io/gateway-controller
+  controllerName: traefik.io/gateway-controller
 
 ---
 kind: Gateway
-apiVersion: networking.x-k8s.io/v1alpha1
+apiVersion: gateway.networking.k8s.io/v1alpha2
 metadata:
   name: my-gateway
   namespace: default
 spec:
   gatewayClassName: my-gateway-class
-  listeners:  # Use GatewayClass defaults for listener definition.
-    - protocol: HTTPS
+  listeners: # Use GatewayClass defaults for listener definition.
+    - name: https
+      protocol: HTTPS
       port: 443
       tls:
-        certificateRef:
-          kind: Secret
-          name: supersecret
-          group: core
-      routes:
-        kind: HTTPRoute
+        certificateRefs:
+          - kind: Secret
+            name: supersecret
+            group: ""
+      allowedRoutes:
         namespaces:
           from: Same
-        selector:
-          matchLabels:
-            app: foo
 
 ---
 kind: HTTPRoute
-apiVersion: networking.x-k8s.io/v1alpha1
+apiVersion: gateway.networking.k8s.io/v1alpha2
 metadata:
   name: http-app-1
   namespace: default
-  labels:
-    app: foo
 spec:
+  parentRefs:
+    - name: my-gateway
+      kind: Gateway
+      group: gateway.networking.k8s.io
   hostnames:
     - "foo.com"
   rules:
@@ -57,7 +56,9 @@ spec:
         - path:
             type: Exact
             value: /bar
-      forwardTo:
-        - serviceName: whoami
+      backendRefs:
+        - name: whoami
           port: 80
           weight: 1
+          kind: Service
+          group: ""