fix: Use audio_in_sample_rate to deserialize data for TwilioFrameSerializer

CHANGELOG.md

@@ -5,6 +5,14 @@ All notable changes to **Pipecat** 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 with the `TwilioFrameSerializer` where
+  `frame.audio_out_sample_rate` was incorrectly used in place of
+  `frame.audio_in_sample_rate`.
+
 ## [0.0.55] - 2025-02-05
 
 ### Added