HUE-9721 [Django Upgrade] upgrading Django 2.1.15 to 2.2.17

Author: agl29

desktop/core/requirements.txt

@@ -9,7 +9,7 @@ channels-redis==2.3.2
 configobj==5.0.6
 cryptography==3.3.2
 django-auth-ldap==1.3.0
-Django==2.1.15 # Django 2 then 3?
+Django==2.2.17 # Django 2 then 3?
 django-axes==4.5.4
 django_babel==0.6.2
 django-celery-beat==1.4.0