Bump django from 4.2.20 to 4.2.21 in /integration_test (#708)

Bumps [django](https://github.com/django/django) from 4.2.20 to 4.2.21.
- [Commits](django/django@4.2.20...4.2.21)

---
updated-dependencies:
- dependency-name: django
  dependency-version: 4.2.21
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

integration_test/requirements.txt

@@ -1,5 +1,5 @@
 -e ..
-Django==4.2.20
+Django==4.2.21
 gunicorn==23.0.0
 psycopg2==2.9.7
 requests==2.32.0