Bump drf-spectacular from 0.27.2 to 0.28.0

Bumps [drf-spectacular](https://github.com/tfranzel/drf-spectacular) from 0.27.2 to 0.28.0.
- [Release notes](https://github.com/tfranzel/drf-spectacular/releases)
- [Changelog](https://github.com/tfranzel/drf-spectacular/blob/master/CHANGELOG.rst)
- [Commits](tfranzel/drf-spectacular@0.27.2...0.28.0)

---
updated-dependencies:
- dependency-name: drf-spectacular
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -20,7 +20,7 @@ django-timezone-field==7.0
 djangorestframework==3.15.2
 djangorestframework-camel-case==1.4.2
 docutils==0.21.2
-drf-spectacular==0.27.2
+drf-spectacular==0.28.0
 firebase-admin==6.5.0
 flower==2.0.1
 gunicorn[gevent]==22.0.0