Bump django from 4.2.15 to 5.1

Bumps [django](https://github.com/django/django) from 4.2.15 to 5.1.
- [Commits](django/django@4.2.15...5.1)

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

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

requirements.txt

@@ -2,7 +2,7 @@ python-magic-bin==0.4.14;platform_system=="Windows"
 argon2-cffi==23.1.0
 bleach==6.1.0
 crispy-bootstrap5==2024.2
-django==4.2.15
+django==5.1
 django-allauth==64.2.0
 django-allauth[mfa]==64.2.0
 django-anymail[mailgun]==11.1