Update src/mcp/client/stdio/__init__.py

Use async versions of .close()

Co-authored-by: ihrpr <inna.hrpr@gmail.com>

Author: LionNatsu

src/mcp/client/stdio/__init__.py

@@ -177,8 +177,8 @@ async def stdin_writer():
                 await terminate_windows_process(process)
             else:
                 process.terminate()
-            read_stream.close()
-            write_stream.close()
+            await read_stream.aclose()
+            await write_stream.aclose()
 
 
 def _get_executable_command(command: str) -> str: