build(deps): Bump django in /testing/plugins_integration

Bumps [django](https://github.com/django/django) from 3.2.8 to 3.2.9.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.2.8...3.2.9)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -1,5 +1,5 @@
 anyio[curio,trio]==3.3.4
-django==3.2.8
+django==3.2.9
 pytest-asyncio==0.16.0
 pytest-bdd==5.0.0
 pytest-cov==3.0.0