Update yamllint to fix dependency issue

I think this still validates everything we need it to

ansible/roles/base/tasks/ssh.yml

@@ -20,7 +20,7 @@
     src: files/sshd_config
     dest: /etc/ssh/sshd_config
     validate: /usr/sbin/sshd -t -f %s
-    backup: yes
+    backup: true
     mode: 0644
   become: true
   register: sshd_config