Fix e2e tests by bumping etcd

Author: sbueringer

test/e2e/config/docker.yaml

@@ -372,7 +372,7 @@ variables:
   KUBERNETES_VERSION_UPGRADE_FROM: "v1.33.1"
   KUBERNETES_VERSION_UPGRADE_TO: "v1.34.0-beta.0"
   KUBERNETES_VERSION_LATEST_CI: "ci/latest-1.34"
-  ETCD_VERSION_UPGRADE_TO: "3.6.1"
+  ETCD_VERSION_UPGRADE_TO: "3.6.1-1"
   COREDNS_VERSION_UPGRADE_TO: "v1.12.1"
   DOCKER_SERVICE_DOMAIN: "cluster.local"
   IP_FAMILY: "dual"