[Snyk] Security upgrade ruby from 3.1.2-slim to 3.2.1-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:3.2.1-slim, as this image has only 46 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
	714	Out-of-bounds Read SNYK-DEBIAN11-LIBTASN16-3061097	No Known Exploit
	514	Inadequate Encryption Strength SNYK-DEBIAN11-OPENSSL-2941242	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-DEBIAN11-OPENSSL-3314584	No Known Exploit
	614	Use After Free SNYK-DEBIAN11-OPENSSL-3314604	No Known Exploit
	614	Double Free SNYK-DEBIAN11-OPENSSL-3314615	No Known Exploit

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🦉 Inadequate Encryption Strength