tests: Tentatively try to fix the debian build

python3-django all 1:1.11.29-1~deb10u1 (debian stable) and django.urls.reverse are not going well together in test apparently.

Broken build to fix [1]

• [1] https://jenkins.softwareheritage.org/job/debian/job/packages/job/DDEP/job/gbp-buildpackage/92/

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Migrated from D5150 (view on Phabricator)