[Snyk] Security upgrade node from 12.18.4-buster to 12-buster

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 Merge Request

• Dockerfile

We recommend upgrading to node:12-buster, as this image has only 441 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
	786	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN10-OPENSSL-2807585	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-PYTHON37-1063182	No Known Exploit
	721	Denial of Service (DoS) SNYK-UPSTREAM-NODE-1040499	Proof of Concept
	721	HTTP Request Smuggling SNYK-UPSTREAM-NODE-1055465	Proof of Concept

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