[Snyk] Security upgrade python from 3.11-rc-alpine to 3.12-rc-alpine

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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 python:3.12-rc-alpine, as this image has only 0 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
	400	Use After Free SNYK-ALPINE316-EXPAT-3062883	No Known Exploit

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