[Snyk] Security upgrade ruby from 3.2.2-slim-bullseye to slim-bullseye

[jonasbn]

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 ruby:slim-bullseye, as this image has only 61 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
	400	Improper Verification of Cryptographic Signature SNYK-DEBIAN11-GNUTLS28-6159417	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
	500	Integer Overflow or Wraparound SNYK-DEBIAN11-ZLIB-6008961	No Known Exploit

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[jonasbn]

This is not going work, I prefer to have the version mentioned in the dependency outline