build: Update grunt to fix security issue
build: Update grunt to fix security issue

npm:
* grunt: 1.0.3 → 1.0.4
  * https://npmjs.com/advisories/788
  * https://npmjs.com/advisories/813

Change-Id: I36a9d28811f4f888baa41ac757c443b839aeef35

wikimedia/mediawiki-extensions-GoogleLogin,wikimedia/mediawiki-extensions-GoogleLogin