Bump drf-spectacular from 0.26.3 to 0.26.4

Bumps [drf-spectacular](https://github.com/tfranzel/drf-spectacular) from 0.26.3 to 0.26.4.
- [Release notes](https://github.com/tfranzel/drf-spectacular/releases)
- [Changelog](https://github.com/tfranzel/drf-spectacular/blob/master/CHANGELOG.rst)
- [Commits](tfranzel/drf-spectacular@0.26.3...0.26.4)

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

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

requirements/base.txt

@@ -9,7 +9,7 @@ crispy-bootstrap3==2022.1
 django-crispy-forms==2.0
 django-filter==23.2
 djangorestframework==3.14.0
-drf-spectacular==0.26.3
+drf-spectacular==0.26.4
 drf-spectacular-sidecar==2023.7.1
 gunicorn==21.2.0
 gviz_api==1.10.0