Update workflows and supported Node.js versions

[targos]

• chore: update GitHub action versions
• chore: update supported Node.js versions
• test: remove custom assertion messages in reporter tests

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.36%. Comparing base (2d354ed) to head (183c52e).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1100      +/-   ##
==========================================
+ Coverage   95.27%   96.36%   +1.09%     
==========================================
  Files          29       29              
  Lines        2201     2201              
==========================================
+ Hits         2097     2121      +24     
+ Misses        104       80      -24     

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