fix(build): remove node 12 support

[cdcabrera]

What's included

• fix(build): remove node 12 support

Notes

• Merging this update will create a 5.0 release of apidoc-mock
• action settings will need to be adjusted for the required versions of node

How to test

Coverage and basic unit test check

1. update the NPM packages with $ yarn
2. $ yarn test
3. confirm tests come back clean

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Example

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Updates issue/story

Ongoing

[codecov-commenter]

Codecov Report

Merging #86 (1631951) into main (785df2a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   70.66%   70.66%           
=======================================
  Files           5        5           
  Lines         242      242           
  Branches       88       88           
=======================================
  Hits          171      171           
  Misses         61       61           
  Partials       10       10           

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