Bump Node.js to 16

[Mrtenz]

Node.js 12 is currently maintenance only, and is soon EOL. Node.js 16 is the current LTS:

[mycrypto-bot]

Staging build: MyCryptoBuilds

[codecov[bot]]

Codecov Report

Merging #4277 (4836589) into master (eab9fa1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4277   +/-   ##
=======================================
  Coverage   78.77%   78.77%           
=======================================
  Files         572      572           
  Lines       12438    12438           
  Branches     3080     3080           
=======================================
  Hits         9798     9798           
  Misses       2608     2608           
  Partials       32       32           

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[stale[bot]]

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[samisbakedham]

This code looks good to me.