[Snyk] Security upgrade node from 16.8 to 16.13.1

[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:16.13.1, as this image has only 398 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
	667	Integer Overflow or Wraparound SNYK-DEBIAN10-EXPAT-2331813	No Known Exploit
	667	Integer Overflow or Wraparound SNYK-DEBIAN10-EXPAT-2331813	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-DEBIAN10-EXPAT-2331818	No Known Exploit
	571	Buffer Overflow SNYK-DEBIAN10-GLIBC-2340915	No Known Exploit
	571	Buffer Overflow SNYK-DEBIAN10-GLIBC-2340923	No Known Exploit

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