algos.diff: Add missed revision_get conversion
This fixes by doing the minimum required so the diff module still works and fix
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[1]. Will release release 0.14.1 asap.
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[1] https://forge.softwareheritage.org/harbormaster/unit/view/918517/
Related to T645
Test Plan
tox
Migrated from D3883 (view on Phabricator)