Remove debug print from websocket extensions test

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: magicmark

tests/test_aiohttp_websocket_subscription.py

@@ -478,8 +478,6 @@ async def test_aiohttp_websocket_subscription_with_extensions(
     async for result in session.subscribe(request):
 
         number = result["number"]
-        print(f"Number received: {number}")
-
         assert number == count
         count -= 1