Fixed django#488 -- Fixed asyncio.set_event_loop() deprecation warning.

asyncio.set_event_loop() is deprecated in Python 3.14 and slated for
removal in Python 3.16.

python/cpython@9fce906

asgiref/sync.py

@@ -259,7 +259,7 @@ def _run_event_loop(self, loop, coro):
         """
         Runs the given event loop (designed to be called in a thread).
         """
-        asyncio.set_event_loop(loop)
+        asyncio.get_event_loop_policy().set_event_loop(loop)
         try:
             loop.run_until_complete(coro)
         finally:
@@ -289,7 +289,7 @@ async def gather():
                     loop.run_until_complete(loop.shutdown_asyncgens())
             finally:
                 loop.close()
-                asyncio.set_event_loop(self.main_event_loop)
+                asyncio.get_event_loop_policy().set_event_loop(self.main_event_loop)
 
     def __get__(self, parent: Any, objtype: Any) -> Callable[_P, _R]:
         """

tests/test_server.py

@@ -108,7 +108,7 @@ def test_stateless_server(server):
     Clients can communicate to other client by name through server"""
 
     loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
+    asyncio.get_event_loop_policy().set_event_loop(loop)
     server.handle = partial(server_auto_close, fut=server.handle(), timeout=1.0)
 
     client1 = Client(name="client1")
@@ -136,7 +136,7 @@ async def check_client2_behavior():
 def test_server_delete_instance(server):
     """The max_applications of Server is 10. After 20 times register, application number should be 10."""
     loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
+    asyncio.get_event_loop_policy().set_event_loop(loop)
     server.handle = partial(server_auto_close, fut=server.handle(), timeout=1.0)
 
     client1 = Client(name="client1")