[Snyk] Security upgrade node from 14.21.2 to 19.6.0-bullseye-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

• test/smoke/docker-root/Dockerfile

We recommend upgrading to node:19.6.0-bullseye-slim, as this image has only 43 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	Integer Overflow or Wraparound SNYK-DEBIAN10-APRUTIL-3261253	No Known Exploit
	471	NULL Pointer Dereference SNYK-DEBIAN10-MARIADB103-3325556	No Known Exploit
	571	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-DEBIAN10-OPENSSL-3314585	No Known Exploit
	571	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-DEBIAN10-OPENSSL-3314585	No Known Exploit
	571	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-DEBIAN10-OPENSSL-3314585	No Known Exploit

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