Evaluation: Avoid dependency on local culture settings.

[minichma]

The use of CultureInfo.CurrentCulture.Calendar is one of the remaining dependencies on the local system settings, which is fixed with this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❌ Your project status has failed because the head coverage (67%) is below the target coverage (80%). You can increase the head coverage or adjust the target coverage.

@@         Coverage Diff         @@
##           main   #759   +/-   ##
===================================
- Coverage    67%    67%   -0%     
===================================
  Files       104    104           
  Lines      4519   4517    -2     
  Branches   1106   1106           
===================================
- Hits       3014   3012    -2     
  Misses     1072   1072           
  Partials    433    433           

Files with missing lines	Coverage Δ
Ical.Net/Evaluation/Evaluator.cs	89% <ø> (-1%)	⬇️
Ical.Net/Evaluation/RecurrencePatternEvaluator.cs	91% <100%> (+<1%)	⬆️

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[axunonb]

Makes sense, just 2 typos (besides Sonar recommendations)

[sonarqubecloud]

Quality Gate failed

Failed conditions
D Maintainability Rating on New Code (required ≥ A)

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[minichma]

Thanks for the review!