feat: cleanup Pydantic warning

A several warnings were addressed following by  https://docs.pydantic.dev/2.10/migration

src/crewai_tools/tools/rag/rag_tool.py

@@ -2,12 +2,11 @@ from abc import ABC, abstractmethod
 from typing import Any
 
 from crewai.tools import BaseTool
-from pydantic import BaseModel, Field, model_validator
+from pydantic import BaseModel, ConfigDict, Field, model_validator
 
 
 class Adapter(BaseModel, ABC):
-    class Config:
-        arbitrary_types_allowed = True
+    model_config = ConfigDict(arbitrary_types_allowed=True)
 
     @abstractmethod
     def query(self, question: str) -> str: