Bump django from 4.2.18 to 4.2.20 (tl-its-umich-edu#1645)

Bumps [django](https://github.com/django/django) from 4.2.18 to 4.2.20.
- [Commits](django/django@4.2.18...4.2.20)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 gunicorn==22.0.0
 
-Django==4.2.18
+Django==4.2.20
 whitenoise==6.6.0
 
 django-cron==0.6.0 #deprecated