Update django-environ to 0.13.0

[pyup-bot]

This PR updates django-environ from 0.11.2 to 0.13.0.

Changelog

0.12.1

-----------------------------
Fixed
+++++
- Fixed PostgreSQL cluster URL parsing with bracketed IPv6 hosts in recent
Python versions, preventing failures in runtime URL parsing and related
regression tests
`574 <https://github.com/joke2k/django-environ/issues/574>`_.
- Fixed debug logging in ``Env.get_value()`` to avoid evaluating lazy default
objects when DEBUG logging is enabled
`571 <https://github.com/joke2k/django-environ/issues/571>`_.

0.12.0

-----------------------------
Fixed
+++++
- Include prefix in the ``ImproperlyConfigured`` error message
`513 <https://github.com/joke2k/django-environ/issues/513>`_.

Added
+++++
- Add support for Python 3.12 and 3.13
`538 <https://github.com/joke2k/django-environ/issues/538>`_.
- Add support for Django 5.1
`535 <https://github.com/joke2k/django-environ/issues/535>`_.
- Add support for Django CockroachDB driver
`509 <https://github.com/joke2k/django-environ/issues/509>`_.
- Add support for Django Channels
`266 <https://github.com/joke2k/django-environ/issues/266>`_.

Changed
+++++++
- Disabled inline comments handling by default due to potential side effects.
While the feature itself is useful, the project's philosophy dictates that
it should not be enabled by default for all users
`499 <https://github.com/joke2k/django-environ/issues/499>`_.

Removed
+++++++
- Removed support of Python 3.6, 3.7 and 3.8
`538 <https://github.com/joke2k/django-environ/issues/538>`_.
- Removed support of Django 1.x.
`538 <https://github.com/joke2k/django-environ/issues/538>`_.

Links

• PyPI: https://pypi.org/project/django-environ
• Changelog: https://data.safetycli.com/changelogs/django-environ/
• Docs: https://django-environ.readthedocs.org

[pyup-bot]

Closing this in favor of #2516