Update app.py

Changed the model to gemini-2.5-flash-preview-05-20 and removed unused imports

app.py

@@ -5,7 +5,6 @@ import inspect
 import pandas as pd
 import asyncio
 from langchain_google_genai.chat_models import ChatGoogleGenerativeAI
-import requests
 from typing import IO, Dict
 from io import BytesIO
 from langchain_core.messages import HumanMessage, SystemMessage
@@ -13,7 +12,6 @@ from langgraph.graph import MessagesState
 from langgraph.graph import START, StateGraph
 from langgraph.prebuilt import tools_condition
 from langgraph.prebuilt import ToolNode
-from pytube import YouTube
 import base64
 from google.ai.generativelanguage_v1beta.types import Tool as GenAITool
 from google.ai.generativelanguage_v1beta.types import FileData
@@ -149,7 +147,7 @@ def google_search(query: str) -> str:
         The search results as a string.
     '''
     llm = ChatGoogleGenerativeAI(
-            model="gemini-2.5-flash-preview-04-17",
+            model="gemini-2.5-flash-preview-05-20",
             max_tokens=8192,
             temperature=0
             )
@@ -163,7 +161,7 @@ def google_search(query: str) -> str:
 class BasicAgent:
     def __init__(self):
         self.llm = ChatGoogleGenerativeAI(
-            model="gemini-2.5-flash-preview-04-17",
+            model="gemini-2.5-flash-preview-05-20",
             max_tokens=8192,
             temperature=0
             )