Update changelog

Author: reinink

CHANGELOG.md

@@ -31,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `overflow-clip`, `overflow-x-clip` and `overflow-y-clip` utilities ([#5630](https://github.com/tailwindlabs/tailwindcss/pull/5630))
 - Add `scroll-snap` utilities ([#5637](https://github.com/tailwindlabs/tailwindcss/pull/5637))
 - Add `border-x` and `border-y` width and color utilities ([#5639](https://github.com/tailwindlabs/tailwindcss/pull/5639))
+- Add `[open]` variant ([#5627](https://github.com/tailwindlabs/tailwindcss/pull/5627))
 
 ### Fixed