Improving yamllint configuration (#11389)

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

roles/download/tasks/prep_kubeadm_images.yml

@@ -18,7 +18,7 @@
   template:
     src: "kubeadm-images.yaml.j2"
     dest: "{{ kube_config_dir }}/kubeadm-images.yaml"
-    mode: 0644
+    mode: "0644"
   when:
     - not skip_kubeadm_images | default(false)
 
@@ -26,7 +26,7 @@
   copy:
     src: "{{ downloads.kubeadm.dest }}"
     dest: "{{ bin_dir }}/kubeadm"
-    mode: 0755
+    mode: "0755"
     remote_src: true
 
 - name: Prep_kubeadm_images | Set kubeadm binary permissions