fix gate (kubernetes#2283)

Author: jichenjc

tests/playbooks/roles/install-docker/defaults/main.yml

@@ -1,2 +1,2 @@
 ---
-docker_version: 5:19.03.15~3-0~ubuntu-focal
+docker_version: 5:20.10.18~3-0~ubuntu-focal

tests/playbooks/roles/install-docker/tasks/main.yml

@@ -28,7 +28,7 @@
 # apt-get update; apt install -y docker-ce=<version>
 - name: Install docker-ce
   apt:
-    name: docker-ce={{ docker_version }}
+    name: docker-ce #={{ docker_version }}
     state: present
     update_cache: yes