promote etcd 3.6.1 image

Author: pacoxu

registry.k8s.io/images/k8s-staging-etcd/images.yaml

@@ -31,6 +31,7 @@
     "sha256:5b19cb5c3eeb06dbbea9d167faef0694d59f513b3d4797801787f95f2742a605": ["3.6.0-rc.1-0"]
     "sha256:0f59a43c4278255aae07b3e97506d3880aff23c6da7e37e117b4b12651e048ad": ["3.6.0-rc.4-0"]
     "sha256:56e65847a2a2735f7847507896f28ecf4662d74fe1cba1da7c66fe63914b4fd1": ["3.6.0-rc.5-0"]
+    "sha256:3ecb80f64e038e0474cbc29c852ab8a25d6c22065bedfa98f40167af5fb988d7": ["3.6.1-0"]
 - name: etcd-empty-dir-cleanup
   dmap:
     "sha256:f805272b4422efa92e20789295c343ed26ff36ddc4f70eeb5d7890d6b758b0fc": ["3.4.7.0"]