Make tests pass after 2020

[bmwiedemann]

Without this patch, at least 2 tests failed in 2020 because their
'refreshed' credentials were still expired.

This PR was done while working on reproducible builds for openSUSE.
For that, we test that our packages can still give identical build results in the future, which is impossible if the build fails.

See https://reproducible-builds.org/ for why this matters.

[codecov-io]

Codecov Report

Merging #1622 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1622   +/-   ##
========================================
  Coverage    91.98%   91.98%           
========================================
  Files           51       51           
  Lines         9318     9318           
========================================
  Hits          8571     8571           
  Misses         747      747

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