[Snyk] Security upgrade python from slim-bullseye to 3.13.0a2-slim

[bcgov-devops]

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

• backend-py/Dockerfile

We recommend upgrading to python:3.13.0a2-slim, as this image has only 38 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
	182	Out-of-bounds Read SNYK-DEBIAN11-DB53-2825168	No Known Exploit
	182	Out-of-Bounds SNYK-DEBIAN11-GLIBC-521063	No Known Exploit
	182	Out-of-Bounds SNYK-DEBIAN11-GLIBC-521063	No Known Exploit
	192	Out-of-Bounds SNYK-DEBIAN11-SQLITE3-6139925	No Known Exploit
	264	Integer Overflow or Wraparound SNYK-DEBIAN11-ZLIB-6008961	No Known Exploit

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Thanks for the PR!

Deployments, as required, will be available below:

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