[Snyk] Security upgrade node from 13 to 16.16.0

[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

• server/samples/clients/node/Dockerfile

We recommend upgrading to node:16.16.0, as this image has only 470 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	Buffer Overflow SNYK-DEBIAN9-PYTHON27-1063180	No Known Exploit
	714	CVE-2019-9636 SNYK-DEBIAN9-PYTHON27-340070	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON27-341379	No Known Exploit
	721	HTTP Request Smuggling SNYK-UPSTREAM-NODE-1055465	Proof of Concept
	721	Privilege Escalation SNYK-UPSTREAM-NODE-1315789	Proof of Concept

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