Bump django from 2.2.6 to 2.2.28 in /application

Bumps [django](https://github.com/django/django) from 2.2.6 to 2.2.28.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.6...2.2.28)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

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

application/requirements.txt

@@ -9,7 +9,7 @@ coreschema==0.0.4
 cryptography==3.3.2
 deepdiff==5.7.0
 defusedxml==0.6.0
-Django==2.2.6
+Django==2.2.28
 django-allauth==0.40.0
 django-bootstrap-modal-forms==1.5.0
 django-bootstrap-pagination==1.7.1