Bump bleach from 3.3.1 to 4.0.0

Bumps [bleach](https://github.com/mozilla/bleach) from 3.3.1 to 4.0.0.
- [Release notes](https://github.com/mozilla/bleach/releases)
- [Changelog](https://github.com/mozilla/bleach/blob/main/CHANGES)
- [Commits](https://github.com/mozilla/bleach/compare/v3.3.1...v4.0.0)

---
updated-dependencies:
- dependency-name: bleach
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -9,7 +9,7 @@ django-filter==2.4.0
 django-tables2==2.4.0
 djangorestframework==3.12.4
 drf-writable-nested==0.6.3
-bleach==3.3.1
+bleach==4.0.0
 bleach-allowlist==1.0.3
 gunicorn==20.1.0
 lxml==4.6.3