Bump django from 3.2.18 to 3.2.20 in /build/semesterly-base

Bumps [django](https://github.com/django/django) from 3.2.18 to 3.2.20.
- [Commits](django/django@3.2.18...3.2.20)

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

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

build/semesterly-base/requirements_base.txt

@@ -11,7 +11,7 @@ celery==5.2.2
 coverage==4.4.1
 cryptography==39.0.1
 dateparser==1.1.0
-Django==3.2.18
+Django==3.2.20
 django-cachalot==2.4.3
 django-extensions==3.1.5
 django-picklefield==3.0.1