ci: update to use codecov

[steven-murray]

Use the codecov-cli instead of the github action uploader, in preparation for using new codecov ATS

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1f3c5e9) 86.58% compared to head (0b105e8) 86.58%.
Report is 1 commits behind head on master.

❗ Current head 0b105e8 differs from pull request most recent head bae9dd3. Consider uploading reports for the commit bae9dd3 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #343   +/-   ##
=======================================
  Coverage   86.58%   86.58%           
=======================================
  Files          12       12           
  Lines        2811     2811           
=======================================
  Hits         2434     2434           
  Misses        377      377           

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