Bump django from 3.2.16 to 3.2.20 in /api

Bumps [django](https://github.com/django/django) from 3.2.16 to 3.2.20.
- [Commits](django/django@3.2.16...3.2.20)

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

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

api/requirements.txt

@@ -1,6 +1,6 @@
 # Common
 psycopg2-binary==2.9.3
-django==3.2.16
+django==3.2.20
 djangorestframework==3.11.2
 django-cors-headers==3.4.0
 whitenoise==5.1.0