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/tests/frontend/specs/redo.js

@@ -22,8 +22,8 @@ describe('undo button then redo button', function () {
     const $undoButton = chrome$('.buttonicon-undo');
     const $redoButton = chrome$('.buttonicon-redo');
     // click the buttons
-    $undoButton.click(); // removes foo
-    $redoButton.click(); // resends foo
+    $undoButton.trigger('click'); // removes foo
+    $redoButton.trigger('click'); // resends foo
 
     await helper.waitForPromise(() => inner$('div span').first().text() === newString);
     const finalValue = inner$('div').first().text();