[Snyk] Security upgrade node from 14.18-alpine to 14.21.2-alpine

[DHedgecock]

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:14.21.2-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
	400	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit
	400	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2434420	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2976173	No Known Exploit
	621	HTTP Request Smuggling SNYK-UPSTREAM-NODE-3035795	Proof of Concept
	614	DNS Rebinding SNYK-UPSTREAM-NODE-3105822	No Known Exploit

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