[Snyk] Security upgrade node from 10.17.0-stretch to dubnium

[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-automation/Dockerfile

We recommend upgrading to node:dubnium, as this image has only 722 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	Integer Overflow or Wraparound SNYK-DEBIAN9-MERCURIAL-311063	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN9-MERCURIAL-311070	No Known Exploit
	714	Incorrect Permission Assignment for Critical Resource SNYK-DEBIAN9-MERCURIAL-311113	No Known Exploit
	786	OS Command Injection SNYK-DEBIAN9-OPENSSL-2807589	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN9-PYTHON27-1063180	No Known Exploit

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