Update requirements.txt

requirements.txt

@@ -1,6 +1,7 @@
-flask>=3.0.0
-flask-cors>=4.0.0
-scikit-learn>=1.3.0
-xgboost>=2.0.0
-pandas>=2.0.0
-numpy>=1.24.0
+flask
+flask-cors
+scikit-learn
+xgboost
+pandas
+numpy
+gunicorn