fix: use quay.io mirror for kube-rbac-proxy image (#9)

Use our own mirror at quay.io/redhat-best-practices-for-k8s instead
of external registries (gcr.io is deprecated, registry.k8s.io may
have rate limits). This gives us full control over image availability.

Author: sebrandon1

config/default/manager_auth_proxy_patch.yaml

@@ -31,7 +31,7 @@ spec:
           capabilities:
             drop:
               - "ALL"
-        image: registry.k8s.io/kubebuilder/kube-rbac-proxy:v0.13.1
+        image: quay.io/redhat-best-practices-for-k8s/kube-rbac-proxy:v0.13.1
         args:
         - "--secure-listen-address=0.0.0.0:8443"
         - "--upstream=http://127.0.0.1:8080/"