allow 0.3 of TestExtras

[KristofferC]

To bring in Jutho/TestExtras.jl@7200046

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.61%. Comparing base (e5cc6b9) to head (5c2b7d6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #24   +/-   ##
=======================================
  Coverage   57.61%   57.61%           
=======================================
  Files          18       18           
  Lines        1352     1352           
=======================================
  Hits          779      779           
  Misses        573      573           

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[lkdvos]

Thanks for this PR, test failures are unrelated and will be resolved as soon as I find the time.