chore(api): bump dependencies

api/requirements.txt

@@ -1,9 +1,9 @@
 captcha~=0.3.0
 celery~=5.0.2
-coverage~=5.3
-cryptography~=3.2.1
+coverage~=5.4
+cryptography~=3.3.1
 Django~=3.1.0
-django-cors-headers~=3.5.0
+django-cors-headers~=3.7.0
 djangorestframework~=3.12.2
 django-celery-email~=3.0.0
 django-netfields~=1.2.2
@@ -14,6 +14,6 @@ psycopg2~=2.8.5
 prometheus-client~=0.9.0  # added to control django-prometheus' dependency version
 psl-dns~=1.0
 pylibmc~=1.6.1
-pyyaml~=5.3.1
+pyyaml~=5.4.1
 requests~=2.25.0
 uwsgi~=2.0.0