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/ext.uls.inputsettings.js

@@ -590,7 +590,7 @@
 	};
 
 	// Register this module to language settings modules
-	$.fn.languagesettings.modules = $.extend( $.fn.languagesettings.modules, {
+	$.fn.languagesettings.modules = Object.assign( $.fn.languagesettings.modules, {
 		input: InputSettings
 	} );