improve: mordernizing validation by migrating pydantic from 1.x to 2.x (#4592)

api/core/rag/datasource/vdb/milvus/milvus_vector.py

@@ -4,7 +4,7 @@ from typing import Any, Optional
 from uuid import uuid4
 
 from flask import current_app
-from pydantic import BaseModel, root_validator
+from pydantic import BaseModel, model_validator
 from pymilvus import MilvusClient, MilvusException, connections
 
 from core.rag.datasource.entity.embedding import Embeddings
@@ -28,7 +28,7 @@ class MilvusConfig(BaseModel):
     batch_size: int = 100
     database: str = "default"
 
-    @root_validator()
+    @model_validator(mode='before')
     def validate_config(cls, values: dict) -> dict:
         if not values.get('host'):
             raise ValueError("config MILVUS_HOST is required")