Fix "There is no current event loop in thread" error in tests (#19134)

changelog.d/19134.bugfix

@@ -0,0 +1 @@
+Add support for Python 3.14.

tests/events/test_auto_accept_invites.py

@@ -19,9 +19,8 @@
 #
 #
 import asyncio
-from asyncio import Future
 from http import HTTPStatus
-from typing import Any, Awaitable, Optional, TypeVar, cast
+from typing import Any, Optional, TypeVar, cast
 from unittest.mock import Mock
 
 import attr
@@ -787,20 +786,12 @@ TV = TypeVar("TV")
 
 
 async def make_awaitable(value: T) -> T:
+    """
+    Makes a fresh awaitable, suitable for mocking an `async` function.
+    """
     return value
 
 
-def make_multiple_awaitable(result: TV) -> Awaitable[TV]:
-    """
-    Makes an awaitable, suitable for mocking an `async` function.
-    This uses Futures as they can be awaited multiple times so can be returned
-    to multiple callers.
-    """
-    future: Future[TV] = Future()
-    future.set_result(result)
-    return future
-
-
 def create_module(
     config_override: Optional[dict[str, Any]] = None, worker_name: Optional[str] = None
 ) -> InviteAutoAccepter:
@@ -809,7 +800,7 @@ def create_module(
     module_api = Mock(spec=ModuleApi)
     module_api.is_mine.side_effect = lambda a: a.split(":")[1] == "test"
     module_api.worker_name = worker_name
-    module_api.sleep.return_value = make_multiple_awaitable(None)
+    module_api.sleep.return_value = lambda *_args, **_kwargs: make_awaitable(None)
     module_api.get_userinfo_by_id.return_value = UserInfo(
         user_id=UserID.from_string("@user:test"),
         is_admin=False,