Update requirements.txt

Author: harshildarji

ETL Machine Learning Deployment/Heroku/requirements.txt

@@ -26,7 +26,7 @@ libopenblas=0.3.15=openmp_hf330de4_1
 llvm-openmp=11.1.0=hf3c4609_1
 markupsafe=2.0.1=py39h5161555_0
 ncurses=6.2=h9aa5885_4
-numpy=1.21.0=py39h1f3b974_0
+numpy>=1.21
 openssl=1.1.1k=h27ca646_0
 pandas=1.2.5=py39h7f752ed_0
 pip=21.1.3=pyhd8ed1ab_0