upgrade GitHub actions, pin Node.js version to 16

[mohsinulhaq]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a525594) 89.72% compared to head (ed32d72) 89.72%.

❗ Current head ed32d72 differs from pull request most recent head 95a4f36. Consider uploading reports for the commit 95a4f36 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #172   +/-   ##
=======================================
  Coverage   89.72%   89.72%           
=======================================
  Files           2        2           
  Lines         146      146           
  Branches       46       47    +1     
=======================================
  Hits          131      131           
  Misses         15       15           

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