build(deps): bump django from 4.2.15 to 5.1.3 in /app

Bumps [django](https://github.com/django/django) from 4.2.15 to 5.1.3.
- [Commits](django/django@4.2.15...5.1.3)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

app/requirements.txt

@@ -1,5 +1,5 @@
 # Core
-Django==4.2.15
+Django==5.1.3
 psycopg2==2.9.3
 celery==5.4.0