Use sagemaker session's s3_resource in download_folder (aws#5064)

Co-authored-by: pintaoz <[email protected]>

Author: pintaoz-aws

src/sagemaker/utils.py

@@ -397,8 +397,7 @@ def download_folder(bucket_name, prefix, target, sagemaker_session):
         sagemaker_session (sagemaker.session.Session): a sagemaker session to
             interact with S3.
     """
-    boto_session = sagemaker_session.boto_session
-    s3 = boto_session.resource("s3", region_name=boto_session.region_name)
+    s3 = sagemaker_session.s3_resource
 
     prefix = prefix.lstrip("/")