Update to jQuery v3.4.0 (Bootstrap 4.x)
Created by: coliff
Bootstrap v4 usually uses the latest available version of jQuery 3.x.
jQuery 3.4.0 is now available - can we update CDN links to use this as it has a minor vulnerability fix and a few performance improvements.
REF: https://blog.jquery.com/2019/04/10/jquery-3-4-0-released/