chore(api): bump requirements

api/requirements.txt

@@ -12,5 +12,5 @@ httpretty~=0.9.0
 mysqlclient~=1.4.0
 psl-dns~=1.0
 pylibmc~=1.6.1
-requests~=2.22.0
+requests~=2.23.0
 uwsgi~=2.0.0