[Snyk] Security upgrade python from 3.6-slim to 3.13.0a3-slim

[aliscco]

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.python-3.6

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	Integer Overflow or Wraparound SNYK-DEBIAN11-EXPAT-2406127	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340908	No Known Exploit
	829	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Mature
	829	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Mature
	714	Out-of-bounds Write SNYK-DEBIAN11-ZLIB-2976151	No Known Exploit

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