Add all required dependencies for backend

requirements.txt

@@ -10,7 +10,7 @@ tiktoken==0.7.0
 rank-bm25==0.2.2
 pypdf==4.2.0
 unstructured==0.14.5
-huggingface-hub==0.34.0   # ✅ compatible with both Gradio + Sentence Transformers
+huggingface-hub==0.23.1   # ✅ compatible with both Gradio + Sentence Transformers
 gradio==5.49.1
 pandas==2.3.3
 numpy