CSDK-2376 fix video renderer VideoFrame.timestamp_us

Author: aconchillo

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to the **daily-python** SDK will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed an issue where `VideoFrame.timestamp_us` was always 0.
+
 ## [0.9.0] - 2024-05-28
 
 ### Fixed