fix: knowledge update backend issue

backend/open_webui/routers/knowledge.py

@@ -309,7 +309,7 @@ async def update_knowledge_by_id(
     knowledge = Knowledges.update_knowledge_by_id(id=id, form_data=form_data)
     if knowledge:
         file_ids = knowledge.data.get("file_ids", []) if knowledge.data else []
-        files = Files.get_files_by_ids(file_ids)
+        files = Files.get_file_metadatas_by_ids(file_ids)
 
         return KnowledgeFilesResponse(
             **knowledge.model_dump(),