Bump django from 3.2.14 to 3.2.15 in /demo/graph_tutorial

Bumps [django](https://github.com/django/django) from 3.2.14 to 3.2.15.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.2.14...3.2.15)

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

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

Author: dependabot[bot]

demo/graph_tutorial/requirements.txt

@@ -3,7 +3,7 @@ certifi==2021.10.8
 cffi==1.15.1
 chardet==4.0.0
 cryptography==36.0.2
-Django==3.2.14
+Django==3.2.15
 idna==3.3
 msal==1.18.0
 pycparser==2.21