Update Changelog

Author: ipavlidakis

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 # Upcoming
 
 ### 🔄 Changed
+- Update WebRTC to 137.0.42 which brings performance improvements on video rendering. [#983](https://github.com/GetStream/stream-video-swift/pull/983)
 
 # [1.34.2](https://github.com/GetStream/stream-video-swift/releases/tag/1.34.2)
 _October 24, 2025_