release date update

Author: v-dharmarajv

sdk/communication/azure-communication-callautomation/CHANGELOG.md

@@ -1,13 +1,15 @@
 # Release History
 
-## 1.4.0 (2025-06-02)
+## 1.4.0 (2025-06-04)
 
 ### Features Added
 
 - Real-time transcription support
 - Audio and DTMF streaming capabilities
 - Integration of ConnectAPI for seamless streaming and transcription
 - Improved media streaming with bidirectional functionality, allowing audio formats in both directions, currently supporting sample rates of 24kHz and 16kHz
+- Support for custom speech models has been integrated into transcription
+- A confidence level for recognized speech has been introduced, ranging from 0.0 to 1.0 when available
 
 ## 1.4.0b1 (2024-11-22)