Update environs[django] requirement

Updates the requirements on [environs[django]](https://github.com/sloria/environs) to permit the latest version.

Updates `environs[django]` to 11.2.0
- [Changelog](https://github.com/sloria/environs/blob/main/CHANGELOG.md)
- [Commits](sloria/environs@11.0.0...11.2.0)

---
updated-dependencies:
- dependency-name: environs[django]
  dependency-type: direct:production
  dependency-group: production-dependencies
...

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

config/requirements/prod.in

@@ -11,7 +11,7 @@ django-allauth~=65.0
 django-crispy-forms~=2.2
 django-maintenance-mode~=0.19
 django-storages~=1.8
-environs[django]~=11.0
+environs[django]~=11.2
 hiredis~=3.0  # needed for Django's native cache and sessions
 psycopg2-binary~=2.8
 pytest-cov~=6.0