Fix test sq_verify_policy_as_of_relative_time

Bernhard M. Wiedemannrequested to merge
bmwiedemann/sequoia-sq:ftbfs2026 into main

Fix test sq_verify_policy_as_of_relative_time

Without this change, it starts to fail after 2026-01-31 because SHA1 is deprecated or such.

This issue was added in commit 70e4935e by @nwalfield

Background: As part of my work on reproducible builds for openSUSE, I check that software still gives identical build results in the future. The usual offset is +16 years, because that is how long I expect some software will be used in some places. This showed up failing tests in our package build. See https://reproducible-builds.org/ for why this matters.

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