Update requirements.txt

requirements.txt

@@ -1,5 +1,6 @@
-gradio==3.31.1
-langchain==0.0.301
-huggingface_hub==0.15.1
-llama-index==0.5.6
-python-dotenv==1.0.0
+gradio
+python-dotenv
+llama-index
+llama-index-embeddings-huggingface
+llama-index-llms-huggingface
+huggingface_hub