Bump django-environ in /{{cookiecutter.project_slug}}

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](joke2k/django-environ@v0.11.2...v0.12.0)

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

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

Author: dependabot[bot]

{{cookiecutter.project_slug}}/Pipfile

@@ -12,7 +12,7 @@ python_version = "3.9"
 cryptography = "~=44.0.2"
 django = "==4.2.20"
 "boto3" = "~=1.35.55"
-django-environ = "~=0.11.2"
+django-environ = "~=0.12.0"
 django-storages = "~=1.14"
 psycopg2 = "<=2.9.9"
 waitress = "~=3.0.2"