cff: Do not change yaml.SafeLoader globally

It may have unexpected side-effects

---

Migrated from D7889 (view on Phabricator)

Build is green

Patch application report for D7889 (id=28466)

Rebasing onto 3adc5a40...

Current branch diff-target is up to date.

Changes applied before test

commit f69131fbec04c75e76490718d3da5bde73cdb4b2
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Tue May 24 17:53:02 2022 +0200

    cff: Do not change yaml.SafeLoader globally
    
    It may have unexpected side-effects

See https://jenkins.softwareheritage.org/job/DCIDX/job/tests-on-diff/228/ for more details.

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