Bump django from 3.2.13 to 3.2.18

Bumps [django](https://github.com/django/django) from 3.2.13 to 3.2.18.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.2.13...3.2.18)

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

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

requirements.txt

@@ -9,7 +9,7 @@ defusedxml==0.7.1
 diff-match-patch==20200713
 dill==0.3.5.1
 dj-database-url==0.5.0
-Django==3.2.13
+Django==3.2.18
 django-background-tasks==1.2.5
 django-compat==1.0.15
 django-cors-headers==3.11.0