Bump to jQuery 3.4.1 in header.html

hestiacp#575

Author: Kristan Kenney

web/templates/header.html

@@ -9,7 +9,7 @@
   <link type="text/css" href="/css/animate.css?1446554103" rel="stylesheet" />
   <link type="text/css" href="/css/jquery-custom-dialogs.css?1446554103" rel="stylesheet" />
   <link type="text/css" href="/css/all.min.css?1446554103" rel="stylesheet" />
-  <script src="/inc/jquery/jquery-3.3.1.min.js"></script>
+  <script src="/inc/jquery/jquery-3.4.1.min.js"></script>
   <script>
     //
     //  GLOBAL SETTINGS