Use test-sdist from maintainer-tools

[blink1073]

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[codecov-commenter]

Codecov Report

Merging #769 (616fb7c) into main (f28d2f7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #769   +/-   ##
=======================================
  Coverage   70.36%   70.36%           
=======================================
  Files          62       62           
  Lines        7571     7571           
  Branches     1249     1249           
=======================================
  Hits         5327     5327           
  Misses       1860     1860           
  Partials      384      384           

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