Drop the retrying dependency

This code hasn't used this module for years (last import removed in 25e415b7).

Test Plan

tox / pytest

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Migrated from D4408 (view on Phabricator)

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Patch application report for D4408 (id=15617)

Rebasing onto b36a9844...

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commit 220678c7531ccae7ce3c0c60e99979047dd349a7
Author: Nicolas Dandrimont <nicolas@dandrimont.eu>
Date:   Tue Nov 3 17:50:18 2020 +0100

    Drop the retrying dependency
    
    This code hasn't used this module for years (last import removed in
    25e415b7e63dd2539b4c00215d8ec15b5ba14641).

See https://jenkins.softwareheritage.org/job/DLDSVN/job/tests-on-diff/100/ for more details.

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