[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

tests/services/sessions/test_api.py

@@ -556,7 +556,6 @@ async def test_restart_kernel(session_client, jp_base_url, jp_fetch, jp_ws_fetch
     model = json.loads(r.body.decode())
     assert model["connections"] == 0
 
-
     # Open a websocket connection.
     ws2 = await jp_ws_fetch("api", "kernels", kid, "channels")
     # Close/open websocket