[Snyk] Security upgrade python from 3.9-slim to 3.14.3-slim

[spolti]

Snyk has created this PR to fix 3 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):

• docs/samples/kafka/transformer.Dockerfile

We recommend upgrading to python:3.14.3-slim, as this image has only 26 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
	CVE-2025-69421 SNYK-DEBIAN13-OPENSSL-15123186	686
	CVE-2025-69421 SNYK-DEBIAN13-OPENSSL-15123186	686
	CVE-2025-69421 SNYK-DEBIAN13-OPENSSL-15123186	686
	CVE-2025-11187 SNYK-DEBIAN13-OPENSSL-15123211	436
	CVE-2025-69418 SNYK-DEBIAN13-OPENSSL-15123213	436

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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