Bump drf-spectacular from 0.20.2 to 0.21.0 (#5427)

Bumps [drf-spectacular](https://github.com/tfranzel/drf-spectacular) from 0.20.2 to 0.21.0.
- [Release notes](https://github.com/tfranzel/drf-spectacular/releases)
- [Changelog](https://github.com/tfranzel/drf-spectacular/blob/master/CHANGELOG.rst)
- [Commits](tfranzel/drf-spectacular@0.20.2...0.21.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -71,6 +71,6 @@ hyperlink==21.0.0
 numpy==1.21.4
 django-test-migrations==1.1.0
 djangosaml2==1.3.4
-drf-spectacular==0.20.2
+drf-spectacular==0.21.0
 django-ratelimit==3.0.1
 argon2-cffi==21.1.0