Restoring a backup gives "Failed exit code 1"
This just means that the owner of the table public.auth_group_id_seq was set to the default owner in your RDS instance. This likely happened because you did not have that owner pre-created in the RDS instance prior to migrating so it utilized the default. This isn't particularly an issue unless you had specific security policies set in your PostgreSQL instance dependent on that owner that you need to replicate in your RDS instance.