Update requirements.txt

requirements.txt

@@ -1,6 +1,4 @@
-gradio==4.14.0
-pandas==1.5.3
-sentence-transformers==2.2.2
-nltk==3.7
-scikit-learn==1.0.2
-huggingface_hub>=0.14.0
+sentence-transformers
+scikit-learn
+pandas
+gradio