refactor/tests: update get_connected_protocol invocation in HTTP tests

- Add `None` argument to `get_connected_protocol` for HTTP upgrade
- This change aligns the function call with its updated signature

Author: vvanglro

tests/protocols/test_http.py

@@ -1026,7 +1026,7 @@ async def test_close_connection_with_multiple_requests(http_protocol_cls: HTTPPr
     config_kw = {}
     if http_protocol_cls == HttpToolsProtocol:
         config_kw = {"lenient_flags": ["lenient_data_after_close"]}
-    protocol = get_connected_protocol(app, http_protocol_cls, **config_kw)
+    protocol = get_connected_protocol(app, http_protocol_cls, None, **config_kw)
     protocol.data_received(REQUEST_AFTER_CONNECTION_CLOSE)
     await protocol.loop.run_one()
     assert b"HTTP/1.1 200 OK" in protocol.transport.buffer