[Snyk] Security upgrade node from 12.16.3-alpine to 12.22.12-alpine

This PR was automatically created by Snyk using the credentials of a real user.

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:12.22.12-alpine, 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
	721	Denial of Service (DoS) SNYK-UPSTREAM-NODE-1040499	Proof of Concept
	721	HTTP Request Smuggling SNYK-UPSTREAM-NODE-1055465	Proof of Concept
	614	Use After Free SNYK-UPSTREAM-NODE-1534880	No Known Exploit
	625	Insufficient Hostname Verification SNYK-UPSTREAM-NODE-570869	No Known Exploit
	625	Memory Corruption SNYK-UPSTREAM-NODE-570870	No Known Exploit

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