[Snyk] Security upgrade node from 16.6.0-slim to 16.16.0-slim

[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

• frontend.Dockerfile

We recommend upgrading to node:16.16.0-slim, as this image has only 70 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	Improper Certificate Validation SNYK-UPSTREAM-NODE-2332185	No Known Exploit
	514	Improper Certificate Validation SNYK-UPSTREAM-NODE-2332191	No Known Exploit
	514	Improper Handling of URL Encoding SNYK-UPSTREAM-NODE-2332192	No Known Exploit

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