Bump django-model-utils from 4.3.1 to 4.4.0

Bumps [django-model-utils](https://github.com/jazzband/django-model-utils) from 4.3.1 to 4.4.0.
- [Release notes](https://github.com/jazzband/django-model-utils/releases)
- [Changelog](https://github.com/jazzband/django-model-utils/blob/master/CHANGES.rst)
- [Commits](jazzband/django-model-utils@4.3.1...4.4.0)

---
updated-dependencies:
- dependency-name: django-model-utils
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/requirements.txt

@@ -80,7 +80,7 @@ django-login-required-middleware==0.9.0
     # via -r requirements/requirements.in
 django-maintenance-mode==0.21.1
     # via -r requirements/requirements.in
-django-model-utils==4.3.1
+django-model-utils==4.4.0
     # via -r requirements/requirements.in
 django-simple-history==3.4.0
     # via