This updates `qunit`, `sass`, and `uglify-js` to thei latest versions. Several other packages are also having their versions bumped as a result of running `npm audit fix`. See #52624. Built from https://develop.svn.wordpress.org/trunk@51097 git-svn-id: http://core.svn.wordpress.org/trunk@50706 1a063a9b-81f0-0310-95a4-ce76da25c4cd