Update requirements.txt

requirements.txt

@@ -1,8 +1,10 @@
-llama-cloud>=1.0        
-llama-index-core>=0.11.0  
-llama-index-llms-openai>=0.2.0  
-pandas>=2.0.0
-pyarrow>=12.0.0
-openpyxl>=3.0.0            
-matplotlib>=3.7.0     
-streamlit              
+streamlit>=1.38.0
+pandas>=2.2.0
+openpyxl>=3.1.0
+python-dotenv>=1.0.0
+llama-index>=0.11.0
+llama-index-core>=0.11.0
+llama-index-llms-openai>=0.3.0
+# optional but useful:
+matplotlib>=3.8.0
+pyarrow>=15.0.0