✅ Move to v8 for coverage

[dubzzz]

Instanbul used to be the default when we relied on Jest. V8 having its own coverage measurements, we are trying to move to it and to see how much it will impact our coverage.

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): ...

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 77bd004:

Sandbox	Source
@fast-check/examples	Configuration

[github-actions]

👋 A preview of the new documentation is available at: http://6612a49f4a79d1bb9e4878d1--dubzzz-fast-check.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.88%. Comparing base (08079e1) to head (77bd004).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4873      +/-   ##
==========================================
+ Coverage   93.49%   96.88%   +3.38%     
==========================================
  Files         207      210       +3     
  Lines        5015    16117   +11102     
  Branches     1314     2620    +1306     
==========================================
+ Hits         4689    15615   +10926     
- Misses        326      502     +176     

Flag	Coverage Δ
unit-tests	96.88% <ø> (+3.38%)	⬆️
unit-tests-18.x-Linux	96.88% <ø> (+3.38%)	⬆️
unit-tests-20.x-Linux	96.88% <ø> (+3.38%)	⬆️
unit-tests-latest-Linux	96.88% <ø> (+3.38%)	⬆️

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