Update dependency django-environ to v0.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-environ (source, changelog)	==0.11.2 -> ==0.12.0

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Release Notes

joke2k/django-environ (django-environ)

v0.12.0

Fixed
+++++

• Include prefix in the ImproperlyConfigured error message
  #&#8203;513 <https://github.com/joke2k/django-environ/issues/513>_.

Added
+++++

• Add support for Python 3.12 and 3.13
  #&#8203;538 <https://github.com/joke2k/django-environ/issues/538>_.
• Add support for Django 5.1
  #&#8203;535 <https://github.com/joke2k/django-environ/issues/535>_.
• Add support for Django CockroachDB driver
  #&#8203;509 <https://github.com/joke2k/django-environ/issues/509>_.
• Add support for Django Channels
  #&#8203;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
  #&#8203;499 <https://github.com/joke2k/django-environ/issues/499>_.

Removed
+++++++

• Removed support of Python 3.6, 3.7 and 3.8
  #&#8203;538 <https://github.com/joke2k/django-environ/issues/538>_.
• Removed support of Django 1.x.
  #&#8203;538 <https://github.com/joke2k/django-environ/issues/538>_.

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