build: Updating npm dependencies

* grunt: 1.3.0 → 1.4.0
* lodash: 4.17.19 → 4.17.21
  * https://npmjs.com/advisories/1673 (CVE-2021-23337)
* hosted-git-info: 3.0.7 → 3.0.8
  * https://npmjs.com/advisories/1677 (CVE-2021-23362)
* postcss: 7.0.35 → 8.2.15
  * https://npmjs.com/advisories/1693 (CVE-2021-23368)

Change-Id: Ibf11e3b512176ecc602eabc43f7135d458fc9b63

package.json

@@ -5,7 +5,7 @@
 	},
 	"devDependencies": {
 		"eslint-config-wikimedia": "0.20.0",
-		"grunt": "1.3.0",
+		"grunt": "1.4.0",
 		"grunt-banana-checker": "0.9.0",
 		"grunt-eslint": "23.0.0",
 		"grunt-stylelint": "0.16.0",