[Snyk] Security upgrade python from 3 to 3.12-rc-slim

[snyk-bot]

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

• django/Dockerfile

We recommend upgrading to python:3.12-rc-slim, as this image has only 46 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
	500	Use After Free SNYK-DEBIAN11-AOM-1298721	No Known Exploit
	500	Buffer Overflow SNYK-DEBIAN11-AOM-1300249	No Known Exploit
	571	Out-of-bounds Write SNYK-DEBIAN11-TIFF-3058787	No Known Exploit
	571	Out-of-bounds Write SNYK-DEBIAN11-TIFF-3058787	No Known Exploit
	571	Out-of-bounds Write SNYK-DEBIAN11-TIFF-3058787	No Known Exploit

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[pythoninthegrass]

Meh.