updated changelog details (#48042)

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG for version 1.34.1

Updated CHANGELOG.md with bug fixes and version date change.

* Fix datastore create and BatchEndpoint serialization bugs

Fixed issues with datastore creation and BatchEndpoint serialization.

Author: Chakradhar886

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

@@ -12,9 +12,11 @@
 
 ### Other Changes
 
-## 1.34.1 (unreleased)
+## 1.34.1 (2026-07-15)
 
-### Bugs Fixed
+### Bugs Fixed 
+
+- Fixed `datastore create` failing with `TypeError: Object of type Datastore is not JSON serializable`. The datastore operation was migrated to the TypeSpec client while the datastore entity still produced a legacy msrest model; the request body is now serialized to its wire form before being sent, keeping the on-the-wire request unchanged.
 - Fixed `BatchEndpoint` defaults serialization regression where `deployment_name` was sent to the service as snake_case instead of camelCase (`deploymentName`), causing `begin_create_or_update` to fail with "Could not find member 'deployment_name' on object of type 'BatchEndpointDefaults'". Serialization now emits the correct camelCase wire format, while `BatchEndpoint.defaults` returned from `get()` continues to expose an object that supports attribute access (e.g. `endpoint.defaults.deployment_name`), preserving backward compatibility with existing code and samples.
 
 ## 1.34.0 (2026-06-11)
@@ -23,8 +25,6 @@
 
 ### Bugs Fixed
 
-
-- Fixed `datastore create` failing with `TypeError: Object of type Datastore is not JSON serializable`. The datastore operation was migrated to the TypeSpec client while the datastore entity still produced a legacy msrest model; the request body is now serialized to its wire form before being sent, keeping the on-the-wire request unchanged.
 - Fixed cross-tenant registry endpoint resolution for deployment template operations by using the registry discovery API instead of ARM calls.
 - Fixed deployment template update failing with immutable field errors by ensuring `allowedInstanceType` and `allowedEnvironmentVariableOverrides` are properly round-tripped during serialization.