updated CHANGELOG.md with the release information 4.14.0b4 (2025-09-11) (#42972)

Author: dibahlfi

sdk/cosmos/azure-cosmos/CHANGELOG.md

@@ -1,16 +1,10 @@
 ## Release History
 
-### 4.14.0b4 (Unreleased)
-
-#### Features Added
-
-#### Breaking Changes
+### 4.14.0b4 (2025-09-11)
 
 #### Bugs Fixed
 * Fixed bug where client provided session token was not respected when client-side session management was disabled. See [PR 42965](https://github.com/Azure/azure-sdk-for-python/pull/42965)
 
-#### Other Changes
-
 ### 4.14.0b3 (2025-09-09)
 
 #### Features Added