conformance: revert ver to v1beta1 for RefGrant

ReferenceGrant's version was moved to `v1` as a mistake in
the conformance test YAML

Relates to kubernetes-sigs#2486

Signed-off-by: Arko Dasgupta <[email protected]>

Author: Arko Dasgupta

conformance/tests/gateway-secret-invalid-reference-grant.yaml

@@ -19,7 +19,7 @@ spec:
             name: certificate
             namespace: gateway-conformance-web-backend
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-namespace
@@ -34,7 +34,7 @@ spec:
       kind: Secret
       name: certificate
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-from-group
@@ -49,7 +49,7 @@ spec:
       kind: Secret
       name: certificate
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-from-kind
@@ -64,7 +64,7 @@ spec:
       kind: Secret
       name: certificate
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-from-namespace
@@ -79,7 +79,7 @@ spec:
       kind: Secret
       name: certificate
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-to-group
@@ -94,7 +94,7 @@ spec:
       kind: Secret
       name: not-the-certificate-youre-looking-for
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-to-kind
@@ -109,7 +109,7 @@ spec:
       kind: Service
       name: certificate
 ---
-apiVersion: gateway.networking.k8s.io/v1
+apiVersion: gateway.networking.k8s.io/v1beta1
 kind: ReferenceGrant
 metadata:
   name: reference-grant-wrong-to-name