[Snyk-dev] Security upgrade node from 14.1.0 to 14.21.3

[snyk-tim]

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 397 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
	714	Directory Traversal SNYK-DEBIAN9-DPKG-2847943	No Known Exploit
	714	NULL Pointer Dereference SNYK-DEBIAN9-IMAGEMAGICK-400971	No Known Exploit
	714	NULL Pointer Dereference SNYK-DEBIAN9-IMAGEMAGICK-400978	No Known Exploit
	714	NULL Pointer Dereference SNYK-DEBIAN9-IMAGEMAGICK-401248	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN9-IMAGEMAGICK-539727	No Known Exploit

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🦉 NULL Pointer Dereference
🦉 Directory Traversal