[Snyk] Security upgrade python from 3.7 to 3.13.0a3

Created by: tristanrobert

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.openfisca

We recommend upgrading to python:3.13.0a3, as this image has only 187 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
	823	Out-of-bounds Write SNYK-DEBIAN12-GLIBC-5927132	Mature
	823	Out-of-bounds Write SNYK-DEBIAN12-GLIBC-5927132	Mature
	823	Out-of-bounds Write SNYK-DEBIAN12-GLIBC-5927132	Mature
	823	Out-of-bounds Write SNYK-DEBIAN12-GLIBC-5927132	Mature
	561	Resource Exhaustion SNYK-DEBIAN12-NGHTTP2-5953379	Mature

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