cache: Don't return objstorage.add's return value, and add types

objstorage.add() will change/remove its return value in a future version, and we do not use it in the vault anyway.

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Migrated from D8016 (view on Phabricator)

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Patch application report for D8016 (id=28881)

Rebasing onto 6436f0bb...

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commit 8ac000b4e1cf7b2e4ec0484e5fa738817fd0b4f1
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Wed Jun 22 11:16:57 2022 +0200

    cache: Don't return objstorage.add's return value, and add types
    
    objstorage.add() will change/remove its return value in a future version,
    and we do not use it in the vault anyway.

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/238/ for more details.

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