web/ui: bump jQuery to 3.5.1 for the legacy UI (#7447)

jQuery prior to 3.4.0 is affected by an Object.prototype pollution
vulnerability (CVE-2019-11358). Even though our code doesn't seem to be
vulnerable to the issue, lets upgrade to the latest jQuery release so we
don't have to bother.

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

web/ui/templates/_base.html

@@ -5,7 +5,7 @@
         <meta name="robots" content="noindex,nofollow">
         <title>{{ pageTitle }}</title>
         <link rel="shortcut icon" href="{{ pathPrefix }}/static/img/favicon.ico?v={{ buildVersion }}">
-        <script src="{{ pathPrefix }}/static/vendor/js/jquery-3.3.1.min.js?v={{ buildVersion }}"></script>    
+        <script src="{{ pathPrefix }}/static/vendor/js/jquery-3.5.1.min.js?v={{ buildVersion }}"></script>
         <script src="{{ pathPrefix }}/static/vendor/js/popper.min.js?v={{ buildVersion }}"></script>
         <script src="{{ pathPrefix }}/static/vendor/bootstrap-4.3.1/js/bootstrap.min.js?v={{ buildVersion }}"></script>