Add autoscaling/vpa-* pattern to k8s-registry docker remote

The VerticalPodAutoscaler rollout pulls registry.k8s.io/autoscaling/vpa-recommender.
Serve it through the existing k8s-registry pull-through cache, consistent with how
external-dns and sig-storage images from registry.k8s.io are already gated.

config/remote_docker/k8s-registry.yaml

@@ -3,5 +3,6 @@ description: Kubernetes container registry
 immutable_ttl: 0
 mutable_ttl: 300
 patterns:
+  - "^autoscaling/vpa-"
   - "^external-dns/external-dns"
   - "^sig-storage/"