Update changelog

Author: cdce8p

CHANGELOG.md

@@ -6,6 +6,8 @@
 
 Mypy only supports Python 3.9+. The \--force-uppercase-builtins flag is now deprecated and a no-op. It will be removed in a future version.
 
+Contributed by Marc Mueller (PR [19176](https://github.com/python/mypy/pull/19176))
+
 ## Mypy 1.16
 
 We’ve just uploaded mypy 1.16 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)).