build(deps): Bump django in /testing/plugins_integration (#14046)

Bumps [django](https://github.com/django/django) from 5.2.9 to 6.0.
- [Commits](django/django@5.2.9...6.0)

---
updated-dependencies:
- dependency-name: django
  dependency-version: '6.0'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -1,5 +1,5 @@
 anyio[trio]==4.12.0
-django==5.2.9
+django==6.0
 pytest-asyncio==1.3.0
 pytest-bdd==8.1.0
 pytest-cov==7.0.0