style: fix pre-commit formatting (trailing whitespace)

Author: github-actions[bot]

src/mcp/client/session.py

@@ -137,7 +137,7 @@ def __init__(
 
         # Experimental: Task handlers (use defaults if not provided)
         self._task_handlers = experimental_task_handlers or ExperimentalTaskHandlers()
-        
+
         # Protocol version (defaults to LATEST_PROTOCOL_VERSION)
         self._protocol_version = protocol_version or types.LATEST_PROTOCOL_VERSION