Bump django from 5.0.2 to 5.1.3 in /docs

Bumps [django](https://github.com/django/django) from 5.0.2 to 5.1.3.
- [Commits](django/django@5.0.2...5.1.3)

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

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

docs/requirements.txt

@@ -7,7 +7,7 @@ furo==2024.1.29
 linkify-it-py==2.0.3
 
 # Django and related packages (for autodoc)
-Django==5.0.2
+Django==5.1.3
 django-markdownx==4.0.7
 django-translated-fields==0.13.0
 django-taggit==6.0.0