Fix: Object of type ModelLifeCycle is not JSON serializable

For commit: 844b558

Author: zhaoqizqwang

sagemaker-core/src/sagemaker/core/model_registry.py

@@ -98,7 +98,7 @@ def get_model_package_args(
     if source_uri is not None:
         model_package_args["source_uri"] = source_uri
     if model_life_cycle is not None:
-        model_package_args["model_life_cycle"] = model_life_cycle
+        model_package_args["model_life_cycle"] = model_life_cycle._to_request_dict()
     if model_card is not None:
         original_req = model_card._create_request_args()
         if original_req.get("ModelCardName") is not None: