[Snyk] Security upgrade node from 16.0.0-buster to 16.15.0-buster

[jalane81]

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

• Dockerfile

We recommend upgrading to node:16.15.0-buster, as this image has only 435 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-DEBIAN10-OPENSSL-1569403	No Known Exploit
	678	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN10-OPENSSL-2426310	No Known Exploit
	778	OS Command Injection SNYK-DEBIAN10-OPENSSL-2807585	No Known Exploit
	721	Privilege Escalation SNYK-UPSTREAM-NODE-1315789	Proof of Concept
	614	Use After Free SNYK-UPSTREAM-NODE-1540540	No Known Exploit

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[github-advanced-security]

Found 100 potential problems in the proposed changes. Check the Files changed tab for more details.