[ML] Increment version to 1.15.0 (#34437)

* Update _version.py

* Update CHANGELOG.md

Author: needuv

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

@@ -1,5 +1,15 @@
 # Release History
 
+## 1.15.0 (unreleased)
+
+### Features Added
+
+### Bugs Fixed
+
+### Breaking Changes
+
+### Other Changes
+
 ## 1.14.0 (unreleased)
 
 ### Features Added
@@ -20,7 +30,7 @@
 
 - Support for Python 3.12
 
-## 1.13.0 (unreleased)
+## 1.13.0 (2024-01-29)
 
 ### Features Added
 

sdk/ml/azure-ai-ml/azure/ai/ml/_version.py

@@ -2,4 +2,4 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # ---------------------------------------------------------
 
-VERSION = "1.14.0"
+VERSION = "1.15.0"