Update django requirement from ==4.2.* to ==5.1.* in /server

Updates the requirements on [django](https://github.com/django/django) to permit the latest version.
- [Commits](django/django@4.2a1...5.1.2)

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

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

server/requirements.txt

@@ -5,7 +5,7 @@ beautifulsoup4==4.12.*
 celery==5.4.*
 channels==4.1.*
 channels_redis==4.2.*
-Django==4.2.*
+Django==5.1.*
 django-cors-headers==4.4.*
 django-decorator-include==3.0
 django-extensions==3.2.*