ci: do not fail fast on tests

[mkniewallner]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added or modified a feature, documentation in docs is updated

Description of changes

Avoids canceling other jobs if tests fail for one specific platform.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.0%. Comparing base (aed094c) to head (351513d).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #767   +/-   ##
=====================================
  Coverage   93.0%   93.0%           
=====================================
  Files         35      35           
  Lines        920     920           
  Branches     165     165           
=====================================
  Hits         856     856           
  Misses        50      50           
  Partials      14      14           

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