[Snyk] Security upgrade python from 3.12-slim to 3.13.0b4-slim

[fnellen]

Snyk has created this PR to fix 5 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• backend/Dockerfile

We recommend upgrading to python:3.13.0b4-slim, as this image has only 43 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Integer Overflow or Wraparound SNYK-DEBIAN12-ZLIB-6008963	500
	Use After Free SNYK-DEBIAN12-SQLITE3-6155400	150
	Link Following SNYK-DEBIAN12-SYSTEMD-1560739	150
	Improper Validation of Integrity Check Value SNYK-DEBIAN12-SYSTEMD-5733385	150
	Improper Validation of Integrity Check Value SNYK-DEBIAN12-SYSTEMD-5733390	150

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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