[Snyk] Security upgrade python from 3.8-slim to 3.13.0a3-slim

[owen-eternal]

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.app

We recommend upgrading to python:3.13.0a3-slim, as this image has only 45 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	Resource Exhaustion SNYK-DEBIAN12-EXPAT-6227597	No Known Exploit
	300	Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') SNYK-DEBIAN12-EXPAT-6227603	No Known Exploit
	471	Allocation of Resources Without Limits or Throttling SNYK-DEBIAN12-SYSTEMD-6277507	No Known Exploit
	471	Allocation of Resources Without Limits or Throttling SNYK-DEBIAN12-SYSTEMD-6277507	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-DEBIAN12-ZLIB-6008963	No Known Exploit

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Allocation of Resources Without Limits or Throttling
🦉 Resource Exhaustion