core[patch]: add caching to get_function_nonlocals (#28131)

libs/core/langchain_core/runnables/utils.py

@@ -388,6 +388,7 @@ def get_lambda_source(func: Callable) -> Optional[str]:
         return name
 
 
+@lru_cache(maxsize=256)
 def get_function_nonlocals(func: Callable) -> list[Any]:
     """Get the nonlocal variables accessed by a function.