Bump django from 4.2.18 to 4.2.20 in /integration_test (rq#695)

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
...

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integration_test/requirements.txt

@@ -1,5 +1,5 @@
 -e ..
-Django==4.2.18
+Django==4.2.20
 gunicorn==22.0.0
 psycopg2==2.9.7
 requests==2.32.0