Update package versions in package.json

Recommended by npm audit.

package.json

@@ -26,11 +26,11 @@
   ],
   "devDependencies": {
     "eslint-config-wikimedia": "0.15.0",
-    "grunt": "1.1.0",
+    "grunt": "1.3",
     "grunt-contrib-qunit": "3.1.0",
     "grunt-eslint": "22.0.0",
     "grunt-stylelint": "0.13.0",
-    "stylelint-config-wikimedia": "0.10.1"
+    "stylelint-config-wikimedia": "0.10.3"
   },
   "repository": {
     "type": "git",