[Snyk] Security upgrade node from 14.1.0 to 14.21.3

[guypod]

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:14.21.3, as this image has only 457 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
	729	Out-of-bounds Write SNYK-DEBIAN9-FREETYPE-1019584	Mature
	729	Out-of-bounds Write SNYK-DEBIAN9-FREETYPE-1019584	Mature
	786	OS Command Injection SNYK-DEBIAN9-MARIADB101-1087460	Mature
	786	OS Command Injection SNYK-DEBIAN9-MARIADB101-1087460	Mature
	786	OS Command Injection SNYK-DEBIAN9-MARIADB101-1087460	Mature

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[github-actions]

Scan Summary

Tool	Critical	High	Medium	Low	Status
Dependency Scan (universal)	14	17	14	0	❌
Shell Script Analysis	0	0	0	5	✅
Security Audit for Infrastructure	2	4	0	2	❌

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