Bump etcd version

Author: wzshiming

pkg/kwokctl/k8s/etcd.go

@@ -20,7 +20,7 @@ import (
 	"math"
 )
 
-// lists from https://github.com/kubernetes/kubernetes/blob/90c6cfd414520ec418263c1ec126edef90ae8955/cmd/kubeadm/app/constants/constants.go#L482
+// lists from https://github.com/kubernetes/kubernetes/blob/0821aa23081420deb0f94c2664f9f74086a7af11/cmd/kubeadm/app/constants/constants.go#L496
 var etcdVersions = map[int]string{
 	8:  "3.0.17",
 	9:  "3.1.12",
@@ -43,10 +43,10 @@ var etcdVersions = map[int]string{
 	26: "3.5.12-0",
 	27: "3.5.12-0",
 	28: "3.5.12-0",
-	29: "3.5.15-0",
-	30: "3.5.15-0",
-	31: "3.5.15-0",
-	32: "3.5.15-0",
+	29: "3.5.16-0",
+	30: "3.5.16-0",
+	31: "3.5.16-0",
+	32: "3.5.16-0",
 }
 
 // GetEtcdVersion returns the etcd version for the given k8s version