Fix OutputFixingParser import path

Author: anas-elghafari

backend/src/mapping_generation/llm_chain.py

@@ -9,7 +9,7 @@
 from .utils import global_logger as logger
 from pydantic.v1 import ValidationError
 from langchain_core.output_parsers import JsonOutputParser
-from langchain.output_parsers import OutputFixingParser
+from langchain.output_parsers.fix import OutputFixingParser
 from typing import List, Dict, Any
 import time
 from langchain_core.callbacks.base import BaseCallbackHandler