[Snyk] Security upgrade node from alpine to 20.1-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:20.1-bullseye-slim, as this image has only 48 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
	300	Out-of-bounds Read SNYK-ALPINE317-OPENSSL-5438697	No Known Exploit
	300	Out-of-bounds Read SNYK-ALPINE317-OPENSSL-5438697	No Known Exploit

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