Argument jsonpath must be single-quoted in "See if node is schedulable" task (#9146)

roles/upgrade/pre-upgrade/tasks/main.yml

@@ -30,7 +30,7 @@
 - name: See if node is schedulable
   command: >
     {{ kubectl }} get node {{ kube_override_hostname|default(inventory_hostname) }}
-    -o jsonpath={ .spec.unschedulable }
+    -o jsonpath='{ .spec.unschedulable }'
   register: kubectl_node_schedulable
   delegate_to: "{{ groups['kube_control_plane'][0] }}"
   failed_when: false