Bump django-environ from 0.7.0 to 0.8.1

Bumps [django-environ](https://github.com/joke2k/django-environ) from 0.7.0 to 0.8.1.
- [Release notes](https://github.com/joke2k/django-environ/releases)
- [Changelog](https://github.com/joke2k/django-environ/blob/main/CHANGELOG.rst)
- [Commits](joke2k/django-environ@v0.7.0...v0.8.1)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -1,5 +1,5 @@
 Django==3.2.9
-django-environ==0.7.0
+django-environ==0.8.1
 psycopg2==2.9.2
 djangorestframework==3.12.4