ci: add node@14

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

no

Motivation / Use-Case

Node@14 was out.

Breaking Changes

no

Additional Info

[codecov]

Codecov Report

Merging #2530 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2530   +/-   ##
=======================================
  Coverage   93.77%   93.77%           
=======================================
  Files          34       34           
  Lines        1333     1333           
  Branches      381      381           
=======================================
  Hits         1250     1250           
  Misses         81       81           
  Partials        2        2           

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[hiroppy]

I merged to use v4 and I'll modify the github config.