Fix websocket provider in test_pycrdt_yjs.py

Author: krassowski

tests/test_pycrdt_yjs.py

@@ -85,7 +85,7 @@ async def test_ypy_yjs_1(yws_server, yjs_client):
     nb = stringify_source(json.loads((files_dir / "nb1.ipynb").read_text()))
     ynotebook.source = nb
     room_name = "my-roomname"
-    async with aconnect_ws(f"http://localhost:{port}/{room_name}") as websocket, WebsocketProvider(
+    async with aconnect_ws(f"http://localhost:{port}/{room_name}") as websocket, Provider(
         ydoc, Websocket(websocket, room_name)
     ):
         output_text = ynotebook.ycells[0]["outputs"][0]["text"]