[Snyk] Security upgrade node from 12.16-alpine to erbium-alpine3.11

[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

• Dockerfile

We recommend upgrading to node:erbium-alpine3.11, as this image has only 0 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
	821	Denial of Service (DoS) SNYK-UPSTREAM-NODE-1040499	Proof of Concept
	821	HTTP Request Smuggling SNYK-UPSTREAM-NODE-1055465	Proof of Concept
	714	Improper Certificate Validation SNYK-UPSTREAM-NODE-1243765	No Known Exploit
	725	Insufficient Hostname Verification SNYK-UPSTREAM-NODE-570869	No Known Exploit
	725	Memory Corruption SNYK-UPSTREAM-NODE-570870	No Known Exploit

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