Update requirements.txt

requirements.txt

@@ -1,3 +1,16 @@
-altair
-pandas
-streamlit
+streamlit>=1.33.0
+
+langgraph>=0.0.40
+langchain>=0.2.10
+langchain-core>=0.2.10
+langchain-mistralai>=0.1.7
+
+pydantic>=2.7.0
+typing-extensions>=4.10.0
+
+python-dotenv>=1.0.1
+
+sentence-transformers>=2.7.0
+faiss-cpu>=1.8.0
+
+pypdf>=4.2.0