[Snyk] Security upgrade node from 12 to 16.0-buster-slim

[snyk-bot]

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

• Dockerfile

We recommend upgrading to node:16.0-buster-slim, as this image has only 60 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
	671	Out-of-bounds Write SNYK-DEBIAN9-GLIBC-356851	Mature
	671	Out-of-bounds Write SNYK-DEBIAN9-GLIBC-356851	Mature
	671	Out-of-bounds Write SNYK-DEBIAN9-GLIBC-356851	Mature
	671	Out-of-bounds Write SNYK-DEBIAN9-GLIBC-356851	Mature
	671	Out-of-bounds Write SNYK-DEBIAN9-GLIBC-356851	Mature

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