Merge "add shield() in aexit" into main

diff --cc lib/sqlalchemy/ext/asyncio/engine.py
index 2418dab884f99ea55459ec5d0e9b14eae4711052,796ddccf5a11fe47b95c9522381a905a32088f91..e8ac10a3d0861db456c5c4664284b71687b3a82a
--- 1/lib/sqlalchemy/ext/asyncio/engine.py
--- 2/lib/sqlalchemy/ext/asyncio/engine.py
+++ b/lib/sqlalchemy/ext/asyncio/engine.py
@@@ -6,8 -6,8 +6,9 @@@
  # the MIT License: https://www.opensource.org/licenses/mit-license.php
  from __future__ import annotations
  
+ import asyncio
  from typing import Any
 +from typing import Callable
  from typing import Dict
  from typing import Generator
  from typing import NoReturn

diff --cc lib/sqlalchemy/ext/asyncio/session.py
index ea587f8de46bcb2cb095a2a97f319f176057a06a,14e08b5c53b46ffd29a50f6a258260ad3c24f1f9..d4b6b6d50aa7a13daa139cafd34c719a23f97885
--- 1/lib/sqlalchemy/ext/asyncio/session.py
--- 2/lib/sqlalchemy/ext/asyncio/session.py
+++ b/lib/sqlalchemy/ext/asyncio/session.py
@@@ -6,8 -6,8 +6,9 @@@
  # the MIT License: https://www.opensource.org/licenses/mit-license.php
  from __future__ import annotations
  
+ import asyncio
  from typing import Any
 +from typing import Callable
  from typing import Dict
  from typing import Generic
  from typing import Iterable