chore(ci): upgrade node to 12

[kerm1it]

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[codecov]

Codecov Report

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The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #199   +/-   ##
=========================================
  Coverage          ?   91.97%           
=========================================
  Files             ?        3           
  Lines             ?      187           
  Branches          ?       52           
=========================================
  Hits              ?      172           
  Misses            ?       15           
  Partials          ?        0           

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