indexer: Fix ever-lasting integration test (jenkins included)
Because it tried to read information it could not.
Implementation wise:
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bump a new swh.scheduler version (uploaded to pypi). Fixtures included allows to deal with tests appropriately (swh-scheduler!16 (closed)).
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update the indexer's requirements on scheduler
Test Plan
tox
The job should finish and be green
Migrated from D766 (view on Phabricator)