Update requirements.txt

requirements.txt

@@ -1,7 +1,7 @@
-langgraph==0.0.7
-langchain-google-genai==0.1.0
-langchain-community==0.0.29
-duckduckgo-search==3.9.7
-wikipedia==1.4.0
-gradio==4.19.1
-python-dotenv==1.0.0
+langgraph
+langchain-google-genai
+langchain-community
+duckduckgo-search
+wikipedia
+gradio
+python-dotenv