feat: use the built in list instead of List

Signed-off-by: Palaniappan R <[email protected]>

backend/src/agents/retriever_graph.py

@@ -1,6 +1,6 @@
 from .retriever_agent import RetrieverAgent
 
-from typing import TypedDict, Annotated, Union, Optional, List
+from typing import TypedDict, Annotated, Union, Optional
 from langchain_core.messages import AnyMessage
 
 from langgraph.graph import START, StateGraph, END
@@ -83,7 +83,7 @@ def generate(self, state: AgentState) -> dict:
 
         return {"messages": []}
 
-    def route(self, state: AgentState) -> List[str]:
+    def route(self, state: AgentState) -> list[str]:
         tools = state["tools"]
         tool_names = []