Bump django in /build/automation/lib/docker/image/python-app/example

Bumps [django](https://github.com/django/django) from 5.1.2 to 5.1.5.
- [Commits](django/django@5.1.2...5.1.5)

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

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

build/automation/lib/docker/image/python-app/example/requirements.txt

@@ -1,2 +1,2 @@
 awscli==1.35.7
-Django==5.1.2
+Django==5.1.5