LibWeb: Port Selection interface from DeprecatedString to String

Author: https://github.com/shannonbooth
Commit: 9f047819a5
Pull-request: https://github.com/SerenityOS/serenity/pull/20799
Reviewed-by: https://github.com/ADKaster ✅

Userland/Libraries/LibWeb/Selection/Selection.idl

@@ -1,7 +1,7 @@
 #import <DOM/Node.idl>
 #import <DOM/Range.idl>
 
-[Exposed=Window]
+[Exposed=Window, UseNewAKString]
 interface Selection {
 
     readonly attribute Node? anchorNode;