Update the archive api for new new invenioRDM version.

[superstar54]

From Valeria,

In new invenioRDM, files are outside metadata in the new api.
See the difference here:
https://staging-archive.materialscloud.org/api/records/1414 current version
https://dev-inveniordm.materialscloud.org/api/records/tqea8-ag515 new version with invenioRDM
also, the record_id will be different.

So, we need to update the script before we move to the new version of the Archive.

optimade-maker/src/optimake/archive/archive_record.py

Line 113 in 94073ac

def get_files(self):

Will come to this later.