fix lint error

dbgpt/storage/vector_store/chroma_store.py

@@ -4,8 +4,8 @@
 from typing import Any, Dict, Iterable, List, Mapping, Optional, Union
 
 from chromadb import PersistentClient
-from chromadb.config import Settings
 from chromadb.api.client import SharedSystemClient
+from chromadb.config import Settings
 
 from dbgpt._private.pydantic import ConfigDict, Field
 from dbgpt.configs.model_config import PILOT_PATH