Add CODECOV_TOKEN in CI

[bvdmitri]

Fixes #292

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.25%. Comparing base (a9aca0e) to head (7f1291f).
Report is 333 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
+ Coverage   79.42%   83.25%   +3.82%     
==========================================
  Files          11       18       +7     
  Lines        1293     1296       +3     
==========================================
+ Hits         1027     1079      +52     
+ Misses        266      217      -49     

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