updated changelog

Author: Daraan

CHANGELOG.md

@@ -16,6 +16,9 @@
   subscripted objects) had wrong parameters if they were directly
   subscripted with an `Unpack` object.
   Patch by [Daraan](https://github.com/Daraan).
+- Fix that lists and ... could not be used for parameter expressions for `TypeAliasType`
+  instances before Python 3.11.
+  Patch by [Daraan](https://github.com/Daraan).
 
 # Release 4.12.2 (June 7, 2024)