gke/cluster/addons: Update dns-horizontal-autoscaler to use multi-arc…

…h image

The staging image was published on
gcr.io/gke-release-staging/cluster-proportional-autoscaler:1.8.4-gke.1

cl/382618524 will promote it to prod.

Tracking issue: b/187872448

Change-Id: I66050f97112c8d44393a6de2c4774727ec94bab7

gke/cluster/addons/dns-horizontal-autoscaler/dns-horizontal-autoscaler.yaml

@@ -86,7 +86,7 @@ spec:
         kubernetes.io/os: linux
       containers:
       - name: autoscaler
-        image: gke.gcr.io/cluster-proportional-autoscaler-amd64:1.8.4-gke.0
+        image: gke.gcr.io/cluster-proportional-autoscaler:1.8.4-gke.1
         resources:
             requests:
                 cpu: "20m"