chore: upgrade to Node 16

[villebro]

🏠 Internal

Upgrade CI to Node 16 and make all Node versions at or above 14 to be supported.

[vercel]

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[codecov]

Codecov Report

Merging #1374 (c355ae1) into master (7ca6bac) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1374   +/-   ##
=======================================
  Coverage   30.49%   30.49%           
=======================================
  Files         496      496           
  Lines        9914     9914           
  Branches     1666     1666           
=======================================
  Hits         3023     3023           
  Misses       6647     6647           
  Partials      244      244           

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[zhaoyongjie]

CI passed! so I think is successful. Thank for the upgrade!