Migrating from 3.7.2 to 3.7.3

Backup database and files

BACKUP. YOUR. DATABASE. AND. FILES.

Fixes and tweaks

• Updated devilry_resend_failed_messages-management command with info to stdout.

Update devilry to 3.7.3

Update the devilry version to 3.7.3 as described in Update Devilry.