Update changelog

Author: adamwathan

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Unify config callback helpers into single object ([#5382](https://github.com/tailwindlabs/tailwindcss/pull/5382))
 - Preserve original color format when adding opacity whenever possible ([#5154](https://github.com/tailwindlabs/tailwindcss/pull/5154))
 - Add `scroll-behavior` utilities ([#5388](https://github.com/tailwindlabs/tailwindcss/pull/5388))
+- Add `border-hidden` utility ([#5485](https://github.com/tailwindlabs/tailwindcss/pull/5485))
 
 ### Fixed