AWS "host_set_ids" is not expected here

When use AWS terraform, get error:
```
│ Error: Unsupported argument
│ 
│   on boundary/targets.tf line 8, in resource "boundary_target" "backend_servers_ssh":
│    8:   host_set_ids = [
│ 
│ An argument named "host_set_ids" is not expected here.
```