[DEPENDABOT] Update: Bump django from 5.1.6 to 5.2.1

Bumps [django](https://github.com/django/django) from 5.1.6 to 5.2.1.
- [Commits](https://github.com/django/django/compare/5.1.6...5.2.1)

---
updated-dependencies:
- dependency-name: django
  dependency-version: 5.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,5 +1,5 @@
 # Django and REST framework
-Django==5.1.6
+Django==5.2.1
 djangorestframework==3.15.2
 django-cors-headers==4.7.0
 
@@ -12,7 +12,7 @@ pyjwt==2.10.1
 # Database
 psycopg2-binary==2.9.10
 dj-database-url==2.3.0
-django-pghistory==3.6.0  # For model history tracking
+django-pghistory==3.5.2  # For model history tracking
 
 # Email
 requests==2.32.3  # For ForwardEmail.net API