sourceforge/tests: Fix failing test with tenacity < 5.1

It fixes debian package build of swh-lister on buster.

Related to swh/infra/sysadm-environment#3310 (closed)

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Migrated from D5711 (view on Phabricator)

Build is green

Patch application report for D5711 (id=20394)

Rebasing onto 3baf1d09...

Current branch diff-target is up to date.

Changes applied before test

commit 1284eb1587036286119c45cd02db6d97006e4f75
Author: Antoine Lambert <antoine.lambert@inria.fr>
Date:   Fri May 7 14:05:36 2021 +0200

    sourceforge/tests: Fix failing test with tenacity < 5.1
    
    It fixes debian package build of swh-lister on buster.

See https://jenkins.softwareheritage.org/job/DLS/job/tests-on-diff/276/ for more details.

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