Update CHANGELOG.md

Author: nuno-vieira

CHANGELOG.md

@@ -4,6 +4,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 # Upcoming
 
 ### 🔄 Changed
+- Message composer now uses `.uploadFile` capability when showing attachment picker icon [#646](https://github.com/GetStream/stream-chat-swiftui/pull/646)
 
 # [4.66.0](https://github.com/GetStream/stream-chat-swiftui/releases/tag/4.66.0)
 _November 06, 2024_