roles/patchwork: Change version and add the notification frequency variable

The deployed patchwork version as been changed to the 2.0.0rc4, and also,
a variable was added that define how often the notification timer runs.

roles/patchwork/defaults/main.yml

@@ -3,8 +3,9 @@ patchwork_dir: '/srv/http/patchwork'
 patchwork_domain: 'patchwork.archlinux.org'
 patchwork_forced_deploy: false
 patchwork_admins: ["('Giancarlo Razzolini', 'grazzolini@archlinux.org')"]
-patchwork_version: '48c0e00a9eef60e40a6f6888df37d599803096dd'
+patchwork_version: '09b821a95ef74c7580b79c655cf782ad9ca7d081'
 patchwork_from_email: 'Arch Linux Patchwork <patchwork@patchwork.archlinux.org>'
+patchwork_notification_frequency: '10m'
 
 patchwork_db: 'patchwork'
 patchwork_db_host: 'localhost'