Add all required dependencies for backend

requirements.txt

@@ -3,14 +3,14 @@ uvicorn==0.29.0
 python-dotenv==1.0.1
 langchain==0.1.16
 langchain-community==0.0.32
-langchain-groq==0.0.1
-sentence-transformers==2.2.2
+langchain-groq==0.3.0
+sentence-transformers==3.0.1
+huggingface-hub==0.34.0
 faiss-cpu==1.7.4
 tiktoken==0.7.0
 rank-bm25==0.2.2
 pypdf==4.2.0
 unstructured==0.14.5
-huggingface-hub==0.23.1   # ✅ compatible with both Gradio + Sentence Transformers
 gradio==5.49.1
 pandas==2.3.3
-numpy
+numpy==1.26.4