Close our PDS Security Plan

### Are you sure this is not a new requirement or bug?

Yes

### 💡 Description

With on-prem and JPL-AWS resources going away, we need to complete migration of all remaining data and resources and close out SSP.

- [ ] https://github.com/NASA-PDS/planetary-data-cloud/issues/194
- [x] Close out RBDs in RISCS