fix retain key

http-api/app/auth.py

@@ -26,7 +26,6 @@ Example
 from dataclasses import asdict, dataclass
 from typing import Any
 
-import boto3
 from aws_lambda_powertools import Logger, Tracer
 from aws_lambda_powertools.utilities.data_classes import event_source
 from aws_lambda_powertools.utilities.data_classes.api_gateway_authorizer_event import (
@@ -38,7 +37,7 @@ from botocore.endpoint_provider import Enum
 from layercake.dynamodb import DynamoDBCollection, DynamoDBPersistenceLayer, KeyPair
 from layercake.funcs import pick
 
-from boto3clients import dynamodb_client
+from boto3clients import dynamodb_client, idp_client
 from cognito import get_user
 from conf import USER_TABLE
 
@@ -46,7 +45,6 @@ APIKEY_PREFIX = 'sk-'
 
 tracer = Tracer()
 logger = Logger(__name__)
-idp_client = boto3.client('cognito-idp')
 user_layer = DynamoDBPersistenceLayer(USER_TABLE, dynamodb_client)
 user_collect = DynamoDBCollection(user_layer)