release(containerservice): update api-version to 2025-10-01

- Updated `api-version` to `2025-10-01` in containerservice changelog
- Marked version 2.57.0 as released on 2025-12-15
- Removed beta status and unreleased tag for 2.57.0
- Moved dependency updates under Other Changes section
- Updated azure-resourcemanager changelog to reflect containerservice changes

Author: v-huizhu2

sdk/containerservice/azure-resourcemanager-containerservice/CHANGELOG.md

@@ -1,14 +1,12 @@
 # Release History
 
-## 2.57.0-beta.2 (Unreleased)
+## 2.57.0 (2025-12-15)
 
-### Features Added
-
-### Breaking Changes
+### Other Changes
 
-### Bugs Fixed
+#### Dependency Updates
 
-### Other Changes
+- Updated `api-version` to `2025-10-01`.
 
 ## 2.57.0-beta.1 (2025-12-01)
 

sdk/resourcemanager/azure-resourcemanager/CHANGELOG.md

@@ -2,13 +2,11 @@
 
 ## 2.58.0-beta.1 (Unreleased)
 
-### Features Added
-
-### Breaking Changes
+### azure-resourcemanager-containerservice
 
-### Bugs Fixed
+#### Dependency Updates
 
-### Other Changes
+- Updated `api-version` to `2025-10-01`.
 
 ## 2.57.0 (2025-11-25)