Bump django from 5.1.4 to 5.1.5 in /server (#812)

Bumps [django](https://github.com/django/django) from 5.1.4 to 5.1.5.
- [Commits](django/django@5.1.4...5.1.5)

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

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server/requirements.txt

@@ -1,4 +1,4 @@
-Django==5.1.4
+Django==5.1.5
 django-celery-results==2.5.1
 django-cors-headers==4.4.0
 django-extensions==3.2.3