Bump django from 2.2.27 to 2.2.28

Bumps [django](https://github.com/django/django) from 2.2.27 to 2.2.28.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.27...2.2.28)

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

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

Author: dependabot[bot]

poetry.lock

@@ -7,7 +7,7 @@ license = "MIT License"
 
 [tool.poetry.dependencies]
 python = "^3.8"
-Django = "==2.2.27"
+Django = "==2.2.28"
 Markdown = "==3.3.4"
 Pillow = "==9.0.1"
 PyPDF2 = "==1.26.0"