Replace gcr.io kube-rbac-proxy image (#300)

`gcr.io` is deprecated and will be shut down https://cloud.google.com/artifact-registry/docs/transition/prepare-gcr-shutdown.

Note that you probably want to switch to the controller runtime built in [filters.WithAuthenticationAndAuthorization](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/metrics/filters#WithAuthenticationAndAuthorization) at some point. We'll let you know if we have an example ready.

config/sliexporter/default/manager_auth_proxy_patch.yaml

@@ -10,7 +10,7 @@ spec:
     spec:
       containers:
       - name: kube-rbac-proxy
-        image: gcr.io/kubebuilder/kube-rbac-proxy:v0.8.0
+        image: quay.io/brancz/kube-rbac-proxy:v0.18.2
         args:
         - "--secure-listen-address=0.0.0.0:8443"
         - "--upstream=http://127.0.0.1:8080/"