fix: Resolve azd crash when using the ai.endpoint service host wi…

…th Python 3.8 (#4092)

* fix: Use typing.List instead of subscripting list

     Support for using builtin types as generics
     (i.e. `list[int]` or `dict[str, str]`) was only added in Python 3.9.

     Before this commit, running `ml_client.py` on Python3.8 would
     crash azd.

     See PEP 385: https://peps.python.org/pep-0585/

* style: Run isort on ml_client.py

cli/azd/resources/ai-python/ml_client.py

@@ -2,22 +2,25 @@
 # coding: utf-8
 
 import argparse
+from typing import List
+
+from azure.ai.ml import MLClient, load_environment, load_model, load_online_deployment, load_online_endpoint
 from azure.identity import AzureDeveloperCliCredential
-from azure.ai.ml import MLClient, load_environment, load_model, load_online_endpoint, load_online_deployment
 
-def create_or_update_environment(client: MLClient, file_path: str, overrides: list[dict]):
+
+def create_or_update_environment(client: MLClient, file_path: str, overrides: List[dict]):
     environment = load_environment(source=file_path, params_override=overrides)
     client.environments.create_or_update(environment)
 
-def create_or_update_model(client: MLClient, file_path: str, overrides: list[dict]):
+def create_or_update_model(client: MLClient, file_path: str, overrides: List[dict]):
     model = load_model(source=file_path, params_override=overrides)
     client.models.create_or_update(model)
 
-def create_or_update_online_endpoint(client: MLClient, file_path: str, overrides: list[dict]):
+def create_or_update_online_endpoint(client: MLClient, file_path: str, overrides: List[dict]):
     online_endpoint = load_online_endpoint(source=file_path, params_override=overrides)
     client.online_endpoints.begin_create_or_update(online_endpoint)
 
-def create_or_update_online_deployment(client: MLClient, file_path: str, overrides: list[dict]):
+def create_or_update_online_deployment(client: MLClient, file_path: str, overrides: List[dict]):
     deployment = load_online_deployment(source=file_path, params_override=overrides)
     client.online_deployments.begin_create_or_update(deployment)