[Snyk] Security upgrade python from 3.8.7-slim to 3.13.0a3-slim

[LowinLi]

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

• docker/dockerfile

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
	714	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	714	Improper Encoding or Escaping of Output SNYK-DEBIAN10-EXPAT-2403513	No Known Exploit
	714	Use After Free SNYK-DEBIAN10-GLIBC-1296899	No Known Exploit
	786	CVE-2023-26604 SNYK-DEBIAN10-SYSTEMD-3339153	Mature
	786	CVE-2023-26604 SNYK-DEBIAN10-SYSTEMD-3339153	Mature

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