Update CI workflows

[targos]

• chore(ci): test on supported Node.js versions
  BREAKING CHANGE: Removed support for Node.js 10 and 15.
• chore(ci): update codecov-action to v2

[codecov]

Codecov Report

Merging #557 (f96a0a9) into main (3c06e07) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #557   +/-   ##
=======================================
  Coverage   82.57%   82.57%           
=======================================
  Files          35       35           
  Lines        1750     1750           
=======================================
  Hits         1445     1445           
  Misses        305      305           

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