Tests: use vitest instead of jest

[adrgautier]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (82baa16) to head (f0a2fc9).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines           20        30   +10     
  Branches         1         9    +8     
=========================================
+ Hits            20        30   +10     

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