update changelog

Author: RobinMalfait

packages/@headlessui-react/CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Improve `Menu` component performance ([#3685](https://github.com/tailwindlabs/headlessui/pull/3685))
 - Improve `Listbox` component performance ([#3688](https://github.com/tailwindlabs/headlessui/pull/3688))
+- Open `Menu` and `Listbox` on `mousedown` ([#3689](https://github.com/tailwindlabs/headlessui/pull/3689))
 
 ## [2.2.1] - 2025-04-04