Changelog update for missing duration catch (Azure#40246)

Author: kingernupur

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

@@ -4,6 +4,11 @@
 
 ### Bugs Fixed
  - Fix for compute Instance, disableLocalAuth property should be depend on ssh public access enabled.
+  
+## 1.26.1 (2025-03-27)
+
+### Bugs Fixed
+ - Handle missing duration value in deployment poller result
 
 ## 1.26.0 (2025-03-11)