Clean up downstream tests

[blink1073]

Use the new downstream test action from maintainer-tools.

[codecov-commenter]

Codecov Report

Merging #629 (4f9f4ff) into master (7e11d8e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #629   +/-   ##
=======================================
  Coverage   77.56%   77.56%           
=======================================
  Files         110      110           
  Lines       10393    10393           
  Branches     1407     1407           
=======================================
  Hits         8061     8061           
  Misses       1933     1933           
  Partials      399      399           

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[Zsailer]

Thanks! This is great!