[Snyk] Security upgrade ruby from 3.4.8-alpine3.23 to 3.4.9-alpine3.23

[rvu-snyk]

Snyk has created this PR to fix 2 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• Dockerfile

We recommend upgrading to ruby:3.4.9-alpine3.23, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Out-of-bounds Write SNYK-ALPINE323-ZLIB-15435528	786
	Improper Validation of Specified Quantity in Input SNYK-ALPINE323-ZLIB-15435529	586

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🦉 Out-of-bounds Write

[rvu-snyk]

This is a patch version upgrade from Ruby 3.4.8 to 3.4.9. The Alpine base image version remains unchanged.

According to the official release notes, this version includes a security update for the zlib gem to address CVE-2026-27820, along with other unspecified bug fixes. Patch releases in Ruby are designed to be backward compatible and not introduce breaking changes.

Action Required: No action is required. This is considered a safe, routine update.

Source: Ruby 3.4.9 Release Notes

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