run ci also on macos and windows

[gaelforget]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.50%. Comparing base (a80134a) to head (bd85198).

Files with missing lines	Patch %	Lines
src/System.jl	50.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   83.31%   83.50%   +0.19%     
==========================================
  Files          12       12              
  Lines        1570     1570              
==========================================
+ Hits         1308     1311       +3     
+ Misses        262      259       -3     

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