chore: switch from 4 to 16-core runners for build workflows

[rix0rrr]

Our build is a lot slower on CI than it is locally. Try using a bigger runner.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.69%. Comparing base (d8eeea8) to head (13add41).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   85.26%   85.69%   +0.43%     
==========================================
  Files         220      220              
  Lines       36619    36619              
  Branches     4448     4499      +51     
==========================================
+ Hits        31222    31381     +159     
+ Misses       5297     5143     -154     
+ Partials      100       95       -5     

Flag	Coverage Δ
suite.unit	85.69% <ø> (+0.43%)	⬆️

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