fix: add explicit setuptools package config

[terriko]

• fixes setuptools currently failing in CI #1623

(Well, maybe, I'm letting CI try it out because it didn't trigger for me locally)

[codecov-commenter]

Codecov Report

Merging #1625 (f1a721f) into main (eb410bf) will decrease coverage by 0.36%.
The diff coverage is 6.66%.

@@            Coverage Diff             @@
##             main    #1625      +/-   ##
==========================================
- Coverage   81.64%   81.27%   -0.37%     
==========================================
  Files         290      290              
  Lines        5796     5811      +15     
  Branches      955      957       +2     
==========================================
- Hits         4732     4723       -9     
- Misses        842      865      +23     
- Partials      222      223       +1     

Flag	Coverage Δ
longtests	81.27% <6.66%> (-0.37%)	⬇️

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Impacted Files	Coverage Δ
cve_bin_tool/cli.py	70.17% <ø> (+0.43%)	⬆️
cve_bin_tool/format_checkers.py	0.00% <0.00%> (ø)
cve_bin_tool/egg_updater.py	96.00% <100.00%> (+0.16%)	⬆️
cve_bin_tool/nvd_api.py	75.00% <0.00%> (-9.49%)	⬇️

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