Bump django from 4.0.8 to 4.1.7 in /demo-django (#348)

Bumps [django](https://github.com/django/django) from 4.0.8 to 4.1.7.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@4.0.8...4.1.7)

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

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demo-django/requirements.txt

@@ -1,2 +1,2 @@
-Django==4.0.8
+Django==4.1.7
 python3-saml