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.txt

@@ -80,7 +80,7 @@ djangorestframework-gis==1.0
 djangorestframework-guardian==0.3.0
 drf-extensions==0.7.1
 drf-writable-nested==0.7.0
-drf-spectacular==0.26.3
+drf-spectacular==0.26.4
 dynamic-rest==2.1.2
 Markdown==3.4.3