[Snyk] Security upgrade node from 10.4.0 to 16.9.1-bullseye-slim

[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:16.9.1-bullseye-slim, as this image has only 38 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
	886	Arbitrary Argument Injection SNYK-DEBIAN8-GIT-340820	Mature
	714	Directory Traversal SNYK-DEBIAN8-PYTHON27-341356	No Known Exploit
	714	Out-of-Bounds SNYK-DEBIAN8-SYSTEMD-305088	No Known Exploit
	786	Race Condition SNYK-DEBIAN8-WGET-300469	Mature
	714	Out-of-bounds Write SNYK-DEBIAN8-WGET-342200	No Known Exploit

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