build: Updating npm dependencies

* eslint-config-wikimedia: 0.28.0 → 0.28.2
  The following rules are failing and were disabled:
  * resources/js:
    * es-x/no-object-assign

* grunt-stylelint: 0.20.0 → 0.20.1
* stylelint-config-wikimedia: 0.17.1 → 0.17.2

Change-Id: I93fa42275d02c006a0dcb2be6fc152c5a0daaa15

resources/js/.eslintrc.json

@@ -7,6 +7,7 @@
 	],
 	"rules": {
 		"no-jquery/no-global-selector": "off",
-		"no-jquery/no-extend": "warn"
+		"no-jquery/no-extend": "warn",
+		"es-x/no-object-assign": "warn"
 	}
 }