Upgrade nodejs version in github action

[jsamr]

Checks

• I have read the contribution guidelines regarding Pull Requests here: https://git.io/JJ0Pg

Description

CI is failing due to outdated NodeJS version.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.45%. Comparing base (a02be71) to head (0784f94).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #670      +/-   ##
==========================================
- Coverage   76.92%   76.45%   -0.48%     
==========================================
  Files          83       83              
  Lines         637      620      -17     
  Branches      147      147              
==========================================
- Hits          490      474      -16     
  Misses          7        7              
+ Partials      140      139       -1     

Flag	Coverage Δ
	76.45% <ø> (?)

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