cosmos: update CHANGELOG for 0.29.0 release (#3300)

Author: analogrelay

sdk/cosmos/azure_data_cosmos/CHANGELOG.md

@@ -1,26 +1,15 @@
 # Release History
 
-## 0.30.0 (Unreleased)
+## 0.29.0 (2025-11-10)
 
 ### Features Added
 
 - Added Regions to pass preferred regions through Cosmos Client Options. ([#3274](https://github.com/Azure/azure-sdk-for-rust/pull/3274))
-
-### Breaking Changes
-
-- Renamed `Response<T, F>::into_body(self) -> Result<Response<T>>` to `into_model(self) -> Result<Response<T>>`. `into_body(self)` now returns a `ResponseBody`.
-
-## 0.29.0 (Unreleased)
-
-### Features Added
-
 - Adjusted the query engine abstraction to support future enhancements and optimizations. ([#3166](https://github.com/Azure/azure-sdk-for-rust/pull/3166))
 
 ### Breaking Changes
 
-### Bugs Fixed
-
-### Other Changes
+- Renamed `Response<T, F>::into_body(self) -> Result<Response<T>>` to `into_model(self) -> Result<Response<T>>`. `into_body(self)` now returns a `ResponseBody`.
 
 ## 0.28.0 (2025-10-07)