Merge pull request #3707 from BrianMouncer/brianem/ubuntu_note

add a note alerting customers that Ubuntu 20.04 support is going away…

Author: prmerger-automator[bot]

articles/ai-services/speech-service/includes/release-notes/release-notes-sdk.md

@@ -11,6 +11,10 @@ ms.author: eur
 
 ### Speech SDK 1.43: 2025-March release
 
+> [!NOTE]
+> [Ubuntu 20.04 "standard security maintenance" expires in April 2025](https://ubuntu.com/about/release-cycle) and will no longer be available as ADO Build agents.
+> Future Speech SDK releases will require Ubuntu 22.04 LTS (instead of Ubuntu 20.04) as the minimum supported version.
+
 #### New features:
   * Updated FromEndpoint API to be the recommended method for constructing a SpeechConfig for most scenarios.
     * Applies to using: