Bump django from 4.2.18 to 4.2.20

Bumps [django](https://github.com/django/django) from 4.2.18 to 4.2.20.
- [Commits](django/django@4.2.18...4.2.20)

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

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

Author: dependabot[bot]

requirements.txt

@@ -25,9 +25,7 @@ beautifulsoup4==4.12.3
 billiard==4.2.1
     # via celery
 bleach[css]==5.0.1
-    # via
-    #   bleach
-    #   django-bleach
+    # via django-bleach
 cached-property==2.0.1
     # via -r requirements.in
 celery==5.4.0
@@ -64,7 +62,7 @@ cryptography==38.0.4
     # via
     #   -r requirements.in
     #   pgpy-dtc
-django==4.2.18
+django==4.2.20
     # via
     #   -r requirements.in
     #   django-bleach