Issue #1928202 by dawehner: Update jQuery Form to the current version (3.27).

core/modules/system/system.module

@@ -1420,7 +1420,7 @@ function system_library_info() {
   $libraries['jquery.form'] = array(
     'title' => 'jQuery Form Plugin',
     'website' => 'http://malsup.com/jquery/form/',
-    'version' => '2.87',
+    'version' => '3.27',
     'js' => array(
       'core/misc/jquery.form.js' => array(),
     ),