[Snyk] Security upgrade python from 3.12.0rc2-alpine to 3.12.3-alpine

[jamesgeddes]

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/backend/Dockerfile

We recommend upgrading to python:3.12.3-alpine, as this image has only 0 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
	614	Resource Exhaustion SNYK-ALPINE318-EXPAT-6241039	No Known Exploit
	514	Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') SNYK-ALPINE318-EXPAT-6241040	No Known Exploit
	614	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	614	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	614	Out-of-Bounds SNYK-ALPINE318-SQLITE-6179217	No Known Exploit

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[giulio-giunta]

Old PR