add quotes around octal values

YAML loaders will load them as strings, providing a consistent behavior. This is also safer as JSON does not support octal values either.

roles/php/tasks/main.yml

@@ -24,6 +24,6 @@
   template:
     dest: /etc/nginx/conf.d/php-handler.conf
     src: php-handler.conf.j2
-    mode: 0644
+    mode: "0644"
   when: '"fpm" in php_modules'
   notify: reload nginx