⬆️ Upgrade actions/{download,upload}-artifact action to v4

[dubzzz]

This reverts commit e0e771b.

Initially planned to apply the suggestion: actions/download-artifact#249 (comment)
But finally did not.

Category:

• ✨ Introduce new features
• 📝 Add or update documentation
• ✅ Add or update tests
• 🐛 Fix a bug
• 🏷️ Add or update types
• ⚡️ Improve performance
• Other(s): ...

Potential impacts:

• Generated values
• Shrink values
• Performance
• Typings
• Other(s): ...

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Sandbox	Source
@fast-check/examples	Configuration

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1046dfd) 93.57% compared to head (d499cd2) 93.57%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4583   +/-   ##
=======================================
  Coverage   93.57%   93.57%           
=======================================
  Files         207      207           
  Lines        5011     5011           
  Branches     1367     1367           
=======================================
  Hits         4689     4689           
  Misses        322      322           

Flag	Coverage Δ
unit-tests	93.57% <ø> (ø)
unit-tests-18.x-Linux	93.57% <ø> (ø)
unit-tests-20.x-Linux	93.57% <ø> (ø)
unit-tests-latest-Linux	93.57% <ø> (ø)

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