ruff check preview (#25653)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/extensions/storage/clickzetta_volume/file_lifecycle.py

@@ -7,6 +7,7 @@ Supports complete lifecycle management for knowledge base files.
 
 import json
 import logging
+import operator
 from dataclasses import asdict, dataclass
 from datetime import datetime
 from enum import StrEnum, auto
@@ -356,7 +357,7 @@ class FileLifecycleManager:
                 # Cleanup old versions for each file
                 for base_filename, versions in file_versions.items():
                     # Sort by version number
-                    versions.sort(key=lambda x: x[0], reverse=True)
+                    versions.sort(key=operator.itemgetter(0), reverse=True)
 
                     # Keep the newest max_versions versions, delete the rest
                     if len(versions) > max_versions: