Fixed ruff format error (E501 Line too long)

Author: maxguru

src/mcp/client/stdio.py

@@ -103,7 +103,11 @@ async def stdio_client(server: StdioServerParameters):
 
     process = await anyio.open_process(
         [server.command, *server.args],
-        env={**get_default_environment(), **server.env} if server.env is not None else get_default_environment(),
+        env=(
+            {**get_default_environment(), **server.env}
+            if server.env is not None
+            else get_default_environment()
+        ),
         stderr=sys.stderr,
         cwd=server.cwd,
     )