PR: Remove CI constraints used with windows-2019

[andfoy]

No description provided.

[codecov-commenter]

Codecov Report

Merging #24 (3e5350f) into main (6f8f775) will increase coverage by 2.43%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   74.52%   76.96%   +2.43%     
==========================================
  Files           8        8              
  Lines        1209     1211       +2     
==========================================
+ Hits          901      932      +31     
+ Misses        308      279      -29     

Flag	Coverage Δ
unittests	76.96% <100.00%> (+2.43%)	⬆️

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Impacted Files	Coverage Δ
src/pty/base.rs	72.09% <100.00%> (+0.08%)	⬆️
src/pty/conpty/pty_impl.rs	70.49% <100.00%> (-0.29%)	⬇️
tests/conpty.rs	89.30% <100.00%> (+17.51%)	⬆️
tests/winpty.rs	98.57% <100.00%> (+1.44%)	⬆️

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