Build the Windows installer for arm64 as well

[tristanlabelle]

Fixes #1834

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.76%. Comparing base (8407445) to head (cdb8cc8).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1839      +/-   ##
==========================================
- Coverage   95.34%   94.76%   -0.59%     
==========================================
  Files          20       20              
  Lines       17978    17978              
==========================================
- Hits        17141    17036     -105     
- Misses        837      942     +105     

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[nicklockwood]

@tristanlabelle there seems to be a problem with the arm64 build: https://github.com/nicklockwood/SwiftFormat/actions/runs/10746115398/job/29806432973

[tristanlabelle]

@nicklockwood ah sorry, workflows are hard to test for contributors. Here's the fix: #1848

[nicklockwood]

Thank you!