chore: fix coverage reports being unusable on CodeCov

[RomainMuller]

Apparently, you need to use the uploader with a checked out source tree

[codecov]

Codecov Report

Merging #134 (b4fc90a) into main (0211747) will increase coverage by 71.5%.
The diff coverage is n/a.

❗ Current head b4fc90a differs from pull request most recent head 59bee6e. Consider uploading reports for the commit 59bee6e to get more accurate results

Additional details and impacted files

Components	Coverage Δ
Parser	75.4% <ø> (∅)
Intermediate Representation	78.6% <ø> (∅)
Synthesizers	61.8% <ø> (∅)
Other	58.8% <ø> (∅)

@@           Coverage Diff           @@
##           main    #134      +/-   ##
=======================================
+ Coverage      0   71.5%   +71.5%     
=======================================
  Files         0      23      +23     
  Lines         0    1894    +1894     
  Branches      0    1894    +1894     
=======================================
+ Hits          0    1354    +1354     
- Misses        0     241     +241     
- Partials      0     299     +299     

see 23 files with indirect coverage changes

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