Bump django from 5.1.4 to 5.1.5 in /requirements

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
...

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

requirements/base.txt

@@ -4,7 +4,7 @@ allpairspy==2.5.1
 bleach==6.2.0
 bleach-allowlist==1.0.3
 defusedxml==0.7.1
-Django==5.1.4
+Django==5.1.5
 django-attachments==1.11
 django-colorfield==0.11.0
 django-contrib-comments==2.2.0