[Snyk] Security upgrade python from 3.5 to 3.12.0a4

[HintikkaKimmo]

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

• {{cookiecutter.project_slug}}/docker/django/Dockerfile-dev

We recommend upgrading to python:3.12.0a4, as this image has only 248 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
	786	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232718	No Known Exploit
	786	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232719	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN10-OPENSSL-2933515	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-PYTHON37-1063182	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-PYTHON37-3090928	No Known Exploit

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