revert default api for container service (Azure#22577)

Author: FumingZhang

specification/containerservice/resource-manager/readme.python.md

@@ -16,7 +16,6 @@ no-namespace-folders: true
 Generate all API versions currently shipped for this package
 
 ```yaml $(python)
-default-api-version: "2023-01-01"
 multiapi: true
 batch:
   - tag: package-2023-01