Use new wrapper for creating background tasks

mautrix_telegram/web/common/auth_api.py

@@ -38,6 +38,7 @@ from telethon.errors import (
 )
 
 from mautrix.bridge import InvalidAccessToken, OnlyLoginSelf
+from mautrix.util import background_task
 from mautrix.util.format_duration import format_duration
 
 from ...commands.telegram.auth import enter_password
@@ -199,7 +200,7 @@ class AuthAPI(abc.ABC):
         existing_user = await User.get_by_tgid(user_info.id)
         if existing_user and existing_user != user:
             await existing_user.log_out()
-        asyncio.create_task(user.post_login(user_info, first_login=True))
+        background_task.create(user.post_login(user_info, first_login=True))
         if user.command_status and user.command_status["action"] == "Login":
             user.command_status = None