chore(api): bump dependency

api/requirements.txt

@@ -1,7 +1,7 @@
 captcha~=0.3.0
 celery~=4.4.0
 coverage~=5.0
-cryptography~=2.8
+cryptography~=3.2.1
 Django~=3.1.0
 django-cors-headers~=3.2.0
 djangorestframework~=3.11.0