Satisfy mypy requirements

[arkid15r]

Proposed change

Based on https://github.com/vacanza/holidays/actions/runs/11356900938
I'm not really sure if it's the best way to address it. Feel free to suggest better options if you see any.

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/pin/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ad44b7c) to head (f64af5e).
Report is 5 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev     #2053   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          190       190           
  Lines        11539     11539           
  Branches      1743      1743           
=========================================
  Hits         11539     11539           

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[PPsyrius]

I did try looking for some alternative ways to satisfy mypy requirements to no avail - this is probably the best we have for now.

[KJhellico]

LGTM.