fix: add node 16 on ci

[anshumanv]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

no

Motivation / Use-Case

run tests on more node versions

Breaking Changes

no

Additional Info

[codecov]

Codecov Report

Merging #3378 (17be714) into master (c0a0228) will decrease coverage by 0.22%.
The diff coverage is n/a.

❗ Current head 17be714 differs from pull request most recent head 6910397. Consider uploading reports for the commit 6910397 to get more accurate results

@@            Coverage Diff             @@
##           master    #3378      +/-   ##
==========================================
- Coverage   95.72%   95.49%   -0.23%     
==========================================
  Files          33       33              
  Lines        1309     1309              
  Branches      388      388              
==========================================
- Hits         1253     1250       -3     
- Misses         52       55       +3     
  Partials        4        4              

Impacted Files	Coverage Δ
lib/utils/DevServerPlugin.js	94.44% <0.00%> (-2.78%)	⬇️

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[anshumanv]

some new warnings in node 16 so snapshot failing, maybe serialize warnings