Improving yamllint configuration (#11389)

Signed-off-by: Bas Meijer <bas.meijer@enexis.nl>

roles/kubernetes/node/tasks/install.yml

@@ -3,7 +3,7 @@
   copy:
     src: "{{ downloads.kubeadm.dest }}"
     dest: "{{ bin_dir }}/kubeadm"
-    mode: 0755
+    mode: "0755"
     remote_src: true
   tags:
     - kubeadm
@@ -14,7 +14,7 @@
   copy:
     src: "{{ downloads.kubelet.dest }}"
     dest: "{{ bin_dir }}/kubelet"
-    mode: 0755
+    mode: "0755"
     remote_src: true
   tags:
     - kubelet