release prepare (Azure#44654)

Author: mssfang

sdk/openai/azure-ai-openai/CHANGELOG.md

@@ -1,16 +1,17 @@
 # Release History
 
-## 1.0.0-beta.15 (Unreleased)
+## 1.0.0-beta.15 (2025-03-14)
 
 ### Features Added
 
 - New subpackage `com.azure.ai.openai.responses` contains support for OpenAI's recently released Responses functionality.
 
-### Breaking Changes
+### Other Changes
 
-### Bugs Fixed
+#### Dependency Updates
 
-### Other Changes
+- Upgraded `azure-core` to version `1.55.3`.
+- Upgraded `azure-core-http-netty` to version `1.15.11`.
 
 ## 1.0.0-beta.14 (2025-02-21)