[Snyk] Security upgrade python from 3.8-slim-buster to 3.13-rc-slim

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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-rc-slim, as this image has only 35 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
	244	Improper Check for Dropped Privileges SNYK-DEBIAN10-BASH-536280	Mature
	241	Out-of-bounds Read SNYK-DEBIAN10-DB53-2825169	No Known Exploit
	208	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	208	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	263	Integer Overflow or Wraparound SNYK-DEBIAN10-ZLIB-6008964	No Known Exploit

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