[Snyk] Security upgrade node from 18.18.2-bullseye-slim to 18.20.1-bullseye-slim

[elranu]

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:18.20.1-bullseye-slim, as this image has only 69 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
	514	Information Exposure SNYK-DEBIAN11-GNUTLS28-6062102	No Known Exploit
	614	Out-of-bounds Write SNYK-DEBIAN11-PERL-6085272	No Known Exploit
	514	Out-of-bounds Read SNYK-DEBIAN11-TAR-3253527	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-DEBIAN11-ZLIB-6008961	No Known Exploit
	471	Allocation of Resources Without Limits or Throttling SNYK-UPSTREAM-NODE-6564548	No Known Exploit

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