fix: format test_client.py with ruff

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: MackinnonBuck

python/test_client.py

@@ -217,9 +217,7 @@ def test_accepts_session_idle_timeout_seconds(self):
         assert client._config.session_idle_timeout_seconds == 600
 
     def test_default_session_idle_timeout_seconds_is_none(self):
-        client = CopilotClient(
-            SubprocessConfig(cli_path=CLI_PATH, log_level="error")
-        )
+        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH, log_level="error"))
         assert isinstance(client._config, SubprocessConfig)
         assert client._config.session_idle_timeout_seconds is None