Bump django-avatar from 7.1.1 to 8.0.0

Bumps [django-avatar](https://github.com/jazzband/django-avatar) from 7.1.1 to 8.0.0.
- [Release notes](https://github.com/jazzband/django-avatar/releases)
- [Changelog](https://github.com/jazzband/django-avatar/blob/main/CHANGELOG.rst)
- [Commits](jazzband/django-avatar@v7.1.1...v8.0.0)

---
updated-dependencies:
- dependency-name: django-avatar
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/requirements/base.txt

@@ -41,7 +41,7 @@ scipy==1.11.4
 dnspython==2.3.0
 django-anymail==10.0  # https://github.com/anymail/django-anymail
 django-autocomplete-light==3.9.7  # https://github.com/yourlabs/django-autocomplete-light
-django-avatar==7.1.1
+django-avatar==8.0.0
 
 numpy==1.26.0
 matplotlib==3.7.1