Update requirements.txt

requirements.txt

@@ -1,8 +1,8 @@
-gradio==4.0.2
-langchain==0.1.0
-langchain-groq==0.1.0
-faiss-cpu==1.7.4
-sentence-transformers==2.2.2
-python-dotenv==1.0.0
-pypdf==3.17.0
-tiktoken==0.5.1
+gradio>=4.0,<5.0
+langchain>=0.1.0,<0.2.0
+langchain-groq>=0.1.0,<0.2.0
+faiss-cpu>=1.7.4,<2.0.0
+sentence-transformers>=2.2.2,<3.0.0
+python-dotenv>=1.0.0,<2.0.0
+pypdf>=3.17.0,<4.0.0
+tiktoken>=0.5.1,<1.0.0