Rename metadata key in data received from the deposit server

This has been changed in latest swh.deposit v1.0. Following indirections and all that lead to this dict being returned on that specific raw_metadata key [1]

• [1] https://forge.softwareheritage.org/source/swh-deposit/browse/master/swh/deposit/api/private/deposit_read.py$201

Related to swh/infra/sysadm-environment#4125 (closed) Related to swh-deposit!320 (closed)

---

Migrated from D7529 (view on Phabricator)