update sdk versions for upcoming sdk release v1.26 (Azure#39918)

* update version for new sdk release

* update release date for 1.26.0

Author: pdhotems

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

@@ -1,5 +1,10 @@
 # Release History
-## 1.26.0 (unreleased)
+## 1.27.0 (unreleased)
+### Features Added
+
+### Bugs Fixed
+
+## 1.26.0 (2025-03-11)
 
 ### Features Added
   - Adding parent job support for command job.

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

@@ -2,4 +2,4 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # ---------------------------------------------------------
 
-VERSION = "1.26.0"
+VERSION = "1.27.0"