[Snyk] Security upgrade node from 16.6.0-slim to 16.15.0-slim

[dineshsonachalam]

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

• frontend.Dockerfile

We recommend upgrading to node:16.15.0-slim, as this image has only 78 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	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	614	Use After Free SNYK-UPSTREAM-NODE-1540540	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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