Fix version reference in changelog

Author: nikic

CHANGELOG.md

@@ -5,7 +5,7 @@ Version 5.6.2 (2025-10-21)
 
 * Fixed formatting-preserving pretty-printing when changing the visibility modifier on a node that
   has attributes.
-* Fixed `chr()` deprecation warning on PHP 8.4
+* Fixed `chr()` deprecation warning on PHP 8.5.
 
 ### Added