Type inheritance for base config still fails validation in v2.4.3

After https://github.com/dagucloud/dagu/pull/1964 if type field is removed from DAG:

```bash
Validation errors

failed to process document 0: failed to build DAG: field 'steps': field 'depends': step '...': depends field is not allowed for DAGs with type 'chain'; use type 'graph' for explicit dependencies (value: [...])
```