migrations: Add missing dependency.

This migration references the "confirmation" app for the first time,
which means we must have migrated at least part of it by this point.

Set the migration to depend on the latest "confirmation" migration at
the time of this migration.

zerver/migrations/0383_revoke_invitations_from_deactivated_users.py

@@ -67,6 +67,7 @@ class Migration(migrations.Migration):
     atomic = False
 
     dependencies = [
+        ("confirmation", "0011_alter_confirmation_expiry_date"),
         ("zerver", "0382_create_role_based_system_groups"),
     ]