[Snyk] Security upgrade python from 3.9-slim to 3.13.0a6-slim

[aantn]

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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:3.13.0a6-slim, as this image has only 50 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
	221	CVE-2024-2511 SNYK-DEBIAN12-OPENSSL-6592092	No Known Exploit
	400	Allocation of Resources Without Limits or Throttling SNYK-DEBIAN12-SYSTEMD-6277507	No Known Exploit
	400	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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🦉 Resource Exhaustion
🦉 Allocation of Resources Without Limits or Throttling

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