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

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

Author: pre-commit-ci[bot]

nbclient/tests/test_client.py

@@ -516,7 +516,7 @@ def start_channels(
             iopub: bool = True,
             stdin: bool = True,
             hb: bool = True,
-            control: bool = True
+            control: bool = True,
         ) -> None:
             raise Exception("Any error")