fix(#496): use valueAsDate instead of returnNativeDates

[MauricioRobayo]

closes #496

[codecov]

Codecov Report

Base: 100.00% // Head: 95.69% // Decreases project coverage by -4.31% ⚠️

Coverage data is based on head (14d8e8b) compared to base (b81e30f).
Patch coverage: 94.28% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #497      +/-   ##
===========================================
- Coverage   100.00%   95.69%   -4.31%     
===========================================
  Files            3        5       +2     
  Lines           42       93      +51     
  Branches         6       35      +29     
===========================================
+ Hits            42       89      +47     
- Misses           0        4       +4     

Impacted Files	Coverage Δ
src/holidays.ts	100.00% <ø> (ø)
src/helpers.ts	91.89% <87.50%> (-8.11%)	⬇️
src/index.ts	96.55% <95.45%> (-3.45%)	⬇️
src/utils/holidaysWithinInterval.ts	100.00% <100.00%> (ø)
src/utils/isHoliday.ts	100.00% <100.00%> (ø)

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