chore: update codecov-action to v5

[mrgrain]

Previously blocked due to bugs in the latest major version. They should now be fixed.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.1%. Comparing base (ca78b1f) to head (94e03c8).
Report is 2 commits behind head on main.

Additional details and impacted files

Components	Coverage Δ
Parser	93.9% <ø> (ø)
Intermediate Representation	93.9% <ø> (ø)
Synthesizers	95.8% <ø> (ø)
Other	29.7% <ø> (ø)

@@          Coverage Diff          @@
##            main    #807   +/-   ##
=====================================
  Coverage   91.1%   91.1%           
=====================================
  Files         25      25           
  Lines       5202    5202           
  Branches    5202    5202           
=====================================
  Hits        4739    4739           
  Misses       451     451           
  Partials      12      12           

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