Bump django from 1.11.29 to 3.2.24 in /requirements

Bumps [django](https://github.com/django/django) from 1.11.29 to 3.2.24.
- [Commits](django/django@1.11.29...3.2.24)

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

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

requirements/docs.txt

@@ -7,7 +7,7 @@ m2r
 sphinx-notfound-page
 
 # for extracting model docs
-django==1.11.29  # pyup: >=1.11,<2
+django==3.2.24  # pyup: >=1.11,<2
 djangorestframework==3.9.1
 django-mptt==0.9.1
 rsa==3.4.2