[Snyk] Security upgrade node from 14.18.0-alpine3.12 to 14.18-alpine3.12

[ChristiaanScheermeijer]

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:14.18-alpine3.12, as this image has only 4 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
	500	CVE-2022-28391 SNYK-ALPINE312-BUSYBOX-2440610	No Known Exploit
	500	CVE-2022-28391 SNYK-ALPINE312-BUSYBOX-2440610	No Known Exploit
	400	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE312-OPENSSL-2426332	No Known Exploit
	400	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE312-OPENSSL-2426332	No Known Exploit
	400	Out-of-bounds Write SNYK-ALPINE312-ZLIB-2434421	No Known Exploit

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