fix: build only the sdist in the release job - #1921

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Merging this PR will not alter performance

✅ 24 untouched benchmarks

_{Comparing release-pure-python-wheel (ad42a78) with master (47ec4ba)¹}

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.87%. Comparing base (47ec4ba) to head (ad42a78).
⚠️ Report is 2 commits behind head on master.

@@           Coverage Diff           @@
##           master    #1921   +/-   ##
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  Coverage   99.87%   99.87%           
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  Files          33       33           
  Lines        3913     3913           
  Branches      568      568           
=======================================
  Hits         3908     3908           
  Misses          3        3           
  Partials        2        2           

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