Bump django from 4.2.17 to 4.2.18 in /docs

Bumps [django](https://github.com/django/django) from 4.2.17 to 4.2.18.
- [Commits](django/django@4.2.17...4.2.18)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -1,6 +1,6 @@
 setuptools==57.5.0
 
-django==4.2.17
+django==4.2.18
 channels==1.1.5
 django-extensions==2.2.5
 mysqlclient==1.3.14