Bump django from 4.2.18 to 4.2.20 in /examples/stacks/django

Bumps [django](https://github.com/django/django) from 4.2.18 to 4.2.20.
- [Commits](django/django@4.2.18...4.2.20)

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

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

Author: dependabot[bot]

examples/stacks/django/requirements.txt

@@ -1,4 +1,4 @@
 asgiref==3.6.0
-Django==4.2.18
+Django==4.2.20
 psycopg2==2.9.5
 sqlparse==0.5.0