ci: use GHA concurrency group

[mayeut]

cancel in progress PR builds if there's a new commit on the PR to free up CI resources.

[codecov]

Codecov Report

Merging #370 (5281929) into main (c3357ae) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #370   +/-   ##
=======================================
  Coverage   92.36%   92.36%           
=======================================
  Files          23       23           
  Lines        1258     1258           
  Branches      307      307           
=======================================
  Hits         1162     1162           
  Misses         55       55           
  Partials       41       41           

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