chore(deps): bump djangorestframework from 3.9.3 to 3.9.4 in /rootfs

Author: duanhongyi

rootfs/requirements.txt

@@ -4,7 +4,7 @@ django==1.11.20
 django-auth-ldap==1.2.15
 django-cors-middleware==1.3.1
 django-guardian==1.4.9
-djangorestframework==3.9.3
+djangorestframework==3.9.4
 docker==3.7.2
 gunicorn==19.9.0
 idna==2.6