[Snyk] Security upgrade python from 3.12.2-slim to 3.13.0a4-slim

[cicirello]

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:3.13.0a4-slim, as this image has only 47 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

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:
🧐 View latest project report

🛠 Adjust project settings

---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 Allocation of Resources Without Limits or Throttling
🦉 Resource Exhaustion

[cicirello]

Closing this pull request as we only use full releases. We'll wait for Python 3.13.0.