Update changelog

Author: testableapple

CHANGELOG.md

@@ -4,7 +4,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 # Upcoming
 
-### 🔄 Changed
+### 🐞 Fixed
+- Fix an issue where CallKit audio was not functioning properly. [#885](https://github.com/GetStream/stream-video-swift/pull/885)
 
 # [1.28.0](https://github.com/GetStream/stream-video-swift/releases/tag/1.28.0)
 _July 01, 2025_