Updating changelog

Author: mattgperry

CHANGELOG.md

@@ -4,6 +4,12 @@ Motion adheres to [Semantic Versioning](http://semver.org/).
 
 Undocumented APIs should be considered internal and may change without warning.
 
+## [12.0.3] 2025-01-23
+
+### Added
+
+-   Added private `anchorX` prop to `AnimatePresence`.
+
 ## [12.0.2] 2025-01-21
 
 ### Fixed