migrations: Update swh.storage.origin_get calls to latest api change
For the sake of staying consistent everywhere.
Related to T645
Test Plan
tox
Migrated from D3607 (view on Phabricator)
Staging instance, all changes can be removed at any time
For the sake of staying consistent everywhere.
Related to T645
tox
Migrated from D3607 (view on Phabricator)