[Snyk] Security upgrade node from 16.16.0 to 16.20

[rasyidf]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• docker/Dockerfile

We recommend upgrading to node:16.20, as this image has only 336 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	714	Exposure of Resource to Wrong Sphere SNYK-DEBIAN10-CURL-3065760	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232718	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232719	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN10-LIBTASN16-3061094	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-PYTHON37-3090928	No Known Exploit

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