Bump python in /{{cookiecutter.project_name}}/docker/django

Bumps python from 3.11.9-slim-bookworm to 3.12.7-slim-bookworm.

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

{{cookiecutter.project_name}}/docker/django/Dockerfile

@@ -2,7 +2,7 @@
 # This Dockerfile uses multi-stage build to customize DEV and PROD images:
 # https://docs.docker.com/develop/develop-images/multistage-build/
 
-FROM python:3.11.9-slim-bookworm AS development_build
+FROM python:3.12.7-slim-bookworm AS development_build
 
 LABEL maintainer="{{ cookiecutter.project_domain }}"
 LABEL vendor="{{ cookiecutter.project_domain }}"