Type hints on varargs and kwargs that take anything should be Any. (#11950)

Type hinting `*args` as `List[Any]` means that each positional argument
should be a list. Type hinting `**kwargs` as `Dict[str, Any]` means that
each keyword argument should be a dict of strings.

This is almost never what we actually wanted, and doesn't seem to be
what we want in any of the cases I'm replacing here.

libs/experimental/langchain_experimental/agents/agent_toolkits/spark/base.py

@@ -42,7 +42,7 @@ def create_spark_dataframe_agent(
     max_execution_time: Optional[float] = None,
     early_stopping_method: str = "force",
     agent_executor_kwargs: Optional[Dict[str, Any]] = None,
-    **kwargs: Dict[str, Any],
+    **kwargs: Any,
 ) -> AgentExecutor:
     """Construct a Spark agent from an LLM and dataframe."""