Bump django-environ from 0.11.2 to 0.12.0

Bumps [django-environ](https://github.com/joke2k/django-environ) from 0.11.2 to 0.12.0.
- [Release notes](https://github.com/joke2k/django-environ/releases)
- [Changelog](https://github.com/joke2k/django-environ/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/joke2k/django-environ/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/base.txt

@@ -14,7 +14,7 @@ uvicorn-worker==0.3.0  # https://github.com/Kludex/uvicorn-worker
 # Django
 # ------------------------------------------------------------------------------
 django==5.0.10  # pyup: < 5.1  # https://www.djangoproject.com/
-django-environ==0.11.2  # https://github.com/joke2k/django-environ
+django-environ==0.12.0  # https://github.com/joke2k/django-environ
 django-model-utils==5.0.0  # https://github.com/jazzband/django-model-utils
 django-allauth[mfa]==65.3.1  # https://github.com/pennersr/django-allauth
 django-crispy-forms==2.3  # https://github.com/django-crispy-forms/django-crispy-forms