chore: drop Node.js 16 in CI

[dhmlau]

Description

It should be part of PR #675.

Related issues

• connect to

Checklist

• [ ] New tests added or existing tests modified to cover all changes
• [x] Code conforms with the style guide

[coveralls]

Pull Request Test Coverage Report for Build 7556878818

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on fix-ci at 84.657%

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Totals
Change from base Build 7556838926:	84.7%
Covered Lines:	2892
Relevant Lines:	3247

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💛 - Coveralls