💚 Fix configuration for rollup esm tests

[dubzzz]

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]

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Latest deployment of this branch, based on commit 50fa833:

Sandbox	Source
Vanilla	Configuration
@fast-check/examples	Configuration

[codecov]

Codecov Report

Merging #3379 (50fa833) into main (2f29d66) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3379      +/-   ##
==========================================
- Coverage   95.51%   95.49%   -0.02%     
==========================================
  Files         213      213              
  Lines        5839     5839              
  Branches     1076     1076              
==========================================
- Hits         5577     5576       -1     
- Misses        262      263       +1     

Flag	Coverage Δ
unit-tests	95.49% <ø> (-0.02%)	⬇️
unit-tests-14.x-Linux	95.49% <ø> (+0.01%)	⬆️
unit-tests-16.x-Linux	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/fast-check/src/arbitrary/unicode.ts	94.44% <0.00%> (-5.56%)	⬇️

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