update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- Nothing yet!
+### Fixed
+
+- Improve support for raw `supports-[…]` queries in arbitrary values ([#13605](https://github.com/tailwindlabs/tailwindcss/pull/13605))
 
 ## [3.4.3] - 2024-03-27