[Snyk] Security upgrade ruby from 3.1.2-slim to 3.2.3-slim

[kigster]

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:3.2.3-slim, as this image has only 43 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
	721	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Proof of Concept
	721	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Proof of Concept
	721	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Proof of Concept
	721	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Proof of Concept
	714	Off-by-one Error SNYK-DEBIAN11-LIBTASN16-3061097	No Known Exploit

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