Add changelog

Author: philipp-spiess

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Ensure `color-mix(…)` polyfills do not cause used CSS variables to be removed ([#17555](https://github.com/tailwindlabs/tailwindcss/pull/17555))
+- Ensure the `color-mix(…)` polyfill creates fallbacks for theme variables that reference other theme variables ([#17562](https://github.com/tailwindlabs/tailwindcss/pull/17562))
 
 ## [4.1.3] - 2025-04-04