Apply ruff formatting

Author: felixweinberger

tests/client/test_stdio.py

@@ -153,7 +153,7 @@ async def test_stdio_client_immediate_completion():
     # Use a Python script that prints and exits immediately
     # This is more consistent across platforms than echo
     script_content = "print('hello')"
-    
+
     server_params = StdioServerParameters(
         command=sys.executable,
         args=["-c", script_content],