build(deps): Bump django in /testing/plugins_integration (#13146)

Bumps [django](https://github.com/django/django) from 5.1.4 to 5.1.5.
- [Commits](django/django@5.1.4...5.1.5)

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

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

testing/plugins_integration/requirements.txt

@@ -1,5 +1,5 @@
 anyio[trio]==4.8.0
-django==5.1.4
+django==5.1.5
 pytest-asyncio==0.25.2
 pytest-bdd==8.1.0
 pytest-cov==6.0.0