[Snyk] Security upgrade python from 3.12.0a1-alpine to 3.12.3-alpine

[michaelsanford]

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

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	614	Out-of-bounds Read SNYK-ALPINE316-E2FSPROGS-3339843	No Known Exploit
	614	Resource Exhaustion SNYK-ALPINE316-EXPAT-6241145	No Known Exploit
	614	Integer Overflow or Wraparound SNYK-ALPINE316-KRB5-3136432	No Known Exploit
	614	Out-of-bounds Write SNYK-ALPINE316-NCURSES-5606597	No Known Exploit
	614	Out-of-bounds Write SNYK-ALPINE316-NCURSES-5606597	No Known Exploit

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