Update requirements.txt

requirements.txt

@@ -1 +1,9 @@
-fastapi\nuvicorn\npython-multipart\nopenai\nfaiss-cpu\npypdf2\npython-dotenv
+fastapi>=0.104.0
+uvicorn[standard]>=0.24.0
+python-multipart>=0.0.6
+PyPDF2>=3.0.0
+openai>=1.3.0
+tiktoken>=0.5.0
+faiss-cpu>=1.7.4
+numpy>=1.24.0
+python-dotenv>=1.0.0