Merge branch 'sortable-version-update' into 'master'

Updated Sortable JS plugin

## What does this MR do?

Updates Sortable JS plugin for issue boards. The older version stopped the issue cards being draggable.

## What are the relevant issue numbers?

Closes #23048

See merge request !6734

CHANGELOG.md

@@ -32,6 +32,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 - Fixed link typo on /help/ui to Alerts section. !6915 (Sam Rose)
 - Fix broken issue/merge request links in JIRA comments. !6143 (Brian Kintz)
 - Fix filtering of milestones with quotes in title (airatshigapov)
+- Fix issue boards dragging bug in Safari
 - Refactor less readable existance checking code from CoffeeScript !6289 (jlogandavison)
 - Update mail_room and enable sentinel support to Reply By Email (!7101)
 - Add task completion status in Issues and Merge Requests tabs: "X of Y tasks completed" (!6527, @gmesalazar)

app/assets/stylesheets/pages/boards.scss

@@ -12,6 +12,10 @@
   opacity: 1!important;
 
   * {
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
     // !important to make sure no style can override this when dragging
     cursor: -webkit-grabbing!important;
     cursor: grabbing!important;