Upgrade Node 18 📤

[AdrieanKhisbe]

Detailed purpose of the PR

Bump travis+nvmrc to latest 18 lts, and engines to first 📤

Will be wise to perform also a global operation of npm audit fix (or yarn equivalent), and library updates

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.02%. Comparing base (56ebb95) to head (23a394f).
Report is 141 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2836      +/-   ##
==========================================
+ Coverage   93.78%   95.02%   +1.23%     
==========================================
  Files         405      511     +106     
  Lines        6224     8456    +2232     
  Branches      435      435              
==========================================
+ Hits         5837     8035    +2198     
- Misses        306      340      +34     
  Partials       81       81              

see 116 files with indirect coverage changes

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