[Snyk] Security upgrade python from 3.9-alpine to 3.12.3-alpine

[NOUIY]

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

• code-samples/eventing/helloworld/helloworld-python/Dockerfile

We recommend upgrading to python:3.12.3-alpine, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

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[guardrails]

⚠️ We detected 1 security issue in this pull request:

Insecure Access Control (1)

Severity	Details	Docs
High	Title: Missing User Instruction docs-1/code-samples/eventing/helloworld/helloworld-python/Dockerfile Line 1 in 2f4f678 FROM python:3.12.3-alpine	📚

More info on how to fix Insecure Access Control in Dockerfile.

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