Update drf-spectacular requirement from ^0.27.1 to ^0.28.0

Updates the requirements on [drf-spectacular](https://github.com/tfranzel/drf-spectacular) to permit the latest version.
- [Release notes](https://github.com/tfranzel/drf-spectacular/releases)
- [Changelog](https://github.com/tfranzel/drf-spectacular/blob/master/CHANGELOG.rst)
- [Commits](tfranzel/drf-spectacular@0.27.1...0.28.0)

---
updated-dependencies:
- dependency-name: drf-spectacular
  dependency-type: direct:production
...

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

pyproject.toml

@@ -28,7 +28,7 @@ django-polymorphic = {git = "https://github.com/jazzband/django-polymorphic.git"
 django-countries = "^7.6.0"
 djangorestframework = {version = "^3.13.1", optional = true}
 django-filter = {version = "^24.1", optional = true}
-drf-spectacular = {version="^0.27.1", optional = true}
+drf-spectacular = {version="^0.28.0", optional = true}
 drf-spectacular-sidecar = {version="^2024.1.1", optional = true}
 django-picklefield = "^3.1"
 httpx = "^0.27.0"