Update changelog for 2.4

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.4.0] - 2021-09-08
+
 ### Breaking changes
 
 - Change collaborative editing features to be enabled via a top-level named export [<CollaborativeEditing>](https://github.com/Automattic/isolated-block-editor/tree/trunk/src/components/collaborative-editing) to avoid unnecessary bundle bloat.
@@ -22,6 +24,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Improved reliability of collaborative editing when multiple peers are typing simultaneously
 - Fix blur event when clicking in some UI components in the block inspector
 
+### Changed
+- Updated all @wordpress packages to latest
+
 ## [2.3.0] - 2021-07-29
 
 ### Added