change requirements versions

requirements.txt

 torch
-torchvision==0.11.3
-numpy==1.21.4
-Flask==2.0.1
-Flask-Cors==3.0.10
-gunicorn==20.1.0
-wheel==0.36.2
-pytest==6.2.3
-tqdm==4.59.0
-matplotlib==3.4.3
-python-dotenv==0.20.0
+torchvision
+numpy
+Flask
+Flask-Cors
+gunicorn
+wheel
+pytest
+tqdm
+matplotlib
+python-dotenv