[Snyk] Security upgrade node from 14.19.0 to 14.19.3

[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:14.19.3, as this image has only 580 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
	686	Buffer Overflow SNYK-DEBIAN9-IMAGEMAGICK-2812517	No Known Exploit
	614	Out-of-bounds Write SNYK-DEBIAN9-LIBXML2-429345	No Known Exploit
	614	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-LIBXML2-429485	No Known Exploit
	614	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-OPENSSL-2426305	No Known Exploit
	778	OS Command Injection SNYK-DEBIAN9-OPENSSL-2807589	No Known Exploit

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