examples: Fix up standalone-etcd.yaml

This YAML was a bit out-of-date, using older etcd and v1beta1 StatefulSet.
Give it a refresh.

Used by:

  ./contrib/scripts/kind.sh
  kubectl apply -f examples/kubernetes/addons/etcd/standalone-etcd.yaml
  kubectl get pods
  # Wait for the ETCD pod to become ready
  cat <<EOF > cilium-etcd.yaml
  identityAllocationMode: kvstore
  nativeRoutingCIDR: "172.16.0.0/12"
  etcd:
    enabled: true
    endpoints:
    - http://$(k get pod etcd-cilium-0 -o json | jq -r '.status.podIP'):32379
  EOF
  helm install cilium cilium/cilium --version 1.9.10 \
    --namespace kube-system -f cilium-etcd.yaml

Signed-off-by: Joe Stringer <joe@cilium.io>

examples/kubernetes/addons/etcd/standalone-etcd.yaml

@@ -31,20 +31,26 @@ spec:
   selector:
     component: "cilium-etcd"
 ---
-apiVersion: apps/v1beta1
+apiVersion: apps/v1
 kind: StatefulSet
 metadata:
   name: "etcd-cilium"
   labels:
     component: "cilium-etcd"
 spec:
+  selector:
+    matchLabels:
+      component: "cilium-etcd"
   serviceName: "cilium-etcd"
   template:
     metadata:
       name: "etcd"
       labels:
         component: "cilium-etcd"
     spec:
+      tolerations:
+      - key: "node.kubernetes.io/not-ready"
+        operator: "Exists"
       hostNetwork: true
       affinity:
         podAntiAffinity:
@@ -58,7 +64,7 @@ spec:
               topologyKey: "kubernetes.io/hostname"
       containers:
       - name: "etcd"
-        image: "quay.io/coreos/etcd:v3.3.2"
+        image: "quay.io/coreos/etcd:v3.3.25"
         env:
         - name: HOSTNAME_IP
           valueFrom: