build(deps): bump django from 5.1.3 to 5.1.5 in /back

Bumps [django](https://github.com/django/django) from 5.1.3 to 5.1.5.
- [Commits](django/django@5.1.3...5.1.5)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

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

back/requirements.txt

@@ -1,5 +1,5 @@
 boto3==1.34.162
-Django==5.1.3
+Django==5.1.5
 django-cors-headers==4.4.0
 django-extensions==3.2.3
 django-storages[s3]==1.14.4