Update the real source of the kube-rbac-proxy image ref

Signed-off-by: Mike Spreitzer <mspreitz@us.ibm.com>

Author: MikeSpreitzer

config/default/manager_auth_proxy_patch.yaml

@@ -41,7 +41,7 @@ spec:
           capabilities:
             drop:
               - "ALL"
-        image: gcr.io/kubebuilder/kube-rbac-proxy:v0.13.1
+        image: quay.io/brancz/kube-rbac-proxy:v0.18.0
         args:
         - "--secure-listen-address=0.0.0.0:8443"
         - "--upstream=http://127.0.0.1:8080/"