[Snyk] Security upgrade node from 14.16.1-buster to fermium

[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:fermium, as this image has only 387 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-DEBIAN10-DPKG-2847944	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232718	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232719	No Known Exploit
	733	Directory Traversal SNYK-DEBIAN10-GIT-3319755	No Known Exploit
	721	Privilege Escalation SNYK-UPSTREAM-NODE-1315789	Proof of Concept

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