Autocomplete: Use a div instead of a span for the live region

Fixes #14587

Author: scottgonzalez

ui/widgets/autocomplete.js

@@ -329,7 +329,7 @@ $.widget( "ui.autocomplete", {
 			}
 		} );
 
-		this.liveRegion = $( "<span>", {
+		this.liveRegion = $( "<div>", {
 			role: "status",
 			"aria-live": "assertive",
 			"aria-relevant": "additions"