refactor: update import statements in tools (langflow-ai#2796)

* fix: update import statement for WikipediaAPI.py

* fix: update import statement for flow_tool.py

* fix: update import statement in StructuredTool

* fix: update import in retriever tool

(cherry picked from commit d897752)

Author: ogabrielluiz

src/backend/base/langflow/base/tools/flow_tool.py

@@ -1,9 +1,8 @@
 from typing import Any, List, Optional, Type
 
 from asyncer import syncify
-from langchain.tools import BaseTool
 from langchain_core.runnables import RunnableConfig
-from langchain_core.tools import ToolException
+from langchain_core.tools import BaseTool, ToolException
 from pydantic.v1 import BaseModel
 
 from langflow.base.flow_processing.utils import build_data_from_result_data, format_flow_output_data

src/backend/base/langflow/components/tools/PythonCodeStructuredTool.py

@@ -2,7 +2,7 @@
 from typing import Any, Dict, List, Optional
 
 from langchain.agents import Tool
-from langchain.tools import StructuredTool
+from langchain_core.tools import StructuredTool
 
 from langflow.custom import CustomComponent
 from langflow.schema.dotdict import dotdict

src/backend/base/langflow/components/tools/RetrieverTool.py

@@ -1,4 +1,4 @@
-from langchain.tools.retriever import create_retriever_tool
+from langchain_core.tools import create_retriever_tool
 
 from langflow.custom import CustomComponent
 from langflow.field_typing import BaseRetriever, Tool

src/backend/base/langflow/components/tools/WikipediaAPI.py

@@ -1,4 +1,5 @@
-from langchain.tools import WikipediaQueryRun
+from typing import cast
+from langchain_community.tools import WikipediaQueryRun
 from langchain_community.utilities.wikipedia import WikipediaAPIWrapper
 
 from langflow.base.langchain_utilities.model import LCToolComponent
@@ -34,7 +35,7 @@ def run_model(self) -> list[Data]:
 
     def build_tool(self) -> Tool:
         wrapper = self._build_wrapper()
-        return WikipediaQueryRun(api_wrapper=wrapper)
+        return cast(Tool, WikipediaQueryRun(api_wrapper=wrapper))
 
     def _build_wrapper(self) -> WikipediaAPIWrapper:
         return WikipediaAPIWrapper(  # type: ignore