Cancel previous CI runs when PR is repushed

[asherf]

see: https://docs.github.com/en/actions/using-jobs/using-concurrency#example-using-concurrency-to-cancel-any-in-progress-job-or-run

[codecov]

Codecov Report

Merging #315 (df81acb) into master (b26c724) will not change coverage.
The diff coverage is n/a.

❗ Current head df81acb differs from pull request most recent head bd19a96. Consider uploading reports for the commit bd19a96 to get more accurate results

@@           Coverage Diff           @@
##           master     #315   +/-   ##
=======================================
  Coverage   92.94%   92.94%           
=======================================
  Files          15       15           
  Lines        1418     1418           
=======================================
  Hits         1318     1318           
  Misses        100      100           

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