Bump django from 2.2.24 to 2.2.28

Bumps [django](https://github.com/django/django) from 2.2.24 to 2.2.28.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.24...2.2.28)

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

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

requirements.txt

@@ -4,7 +4,7 @@
 # mysqlclient==1.3.14
 # the my Ubuntu 20.04 on pythonanywhere needs
 # mysqlclient==1.3.7
-Django==1.10
+Django==2.2.28
 configparser==3.5.0
 django-forms-bootstrap==3.0.1
 django-registration-redux==1.4