[Snyk] Security upgrade node from 16.13.2-alpine to 16.15.0-alpine

[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:16.15.0-alpine, as this image has only 8 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
	571	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2976173	No Known Exploit
	514	HTTP Request Smuggling SNYK-UPSTREAM-NODE-2946428	No Known Exploit
	514	HTTP Request Smuggling SNYK-UPSTREAM-NODE-2946723	No Known Exploit
	514	DLL Hijacking SNYK-UPSTREAM-NODE-2946727	No Known Exploit
	514	Information Exposure SNYK-UPSTREAM-NODE-2946729	No Known Exploit

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[liss-bot]

This PR is stale because it has been open 6 weeks with no activity. Either remove the stale label or comment below with a short update, otherwise this PR will be closed in 5 days.