Update jQuery to 3.7 and fix admintests (#5868)

* jQuery: Migrate to `.on()`, `.off()`, `.trigger()`

This avoids methods that are deprecated in newer versions of jQuery.

* jQuery: avoid `.removeAttr`, prefer `.prop`

* helper.edit: wait up to 10 seconds for ACCEPT_COMMIT

* Chat: disabled attribute is boolean

* Chat: avoid inline onclick handler to support jQuery 3.4+

* jQuery: update to version 3.6.0

* Update to 3.7

* Removed deprecated event.

* Revert change to focus on padeditor.ace

---------

Co-authored-by: webzwo0i <webzwo0i@c3d2.de>

src/static/js/vendors/nice-select.js

@@ -123,7 +123,7 @@
         $dropdown.find('.list').css('max-height', $maxListHeight + 'px');
 
       } else {
-        $dropdown.focus();
+        $dropdown.trigger('focus');
       }
     });