build(deps): Bump django in /testing/plugins_integration (#12710)

Bumps [django](https://github.com/django/django) from 5.0.8 to 5.1.
- [Commits](django/django@5.0.8...5.1)

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

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[curio,trio]==4.4.0
-django==5.0.8
+django==5.1
 pytest-asyncio==0.23.8
 pytest-bdd==7.2.0
 pytest-cov==5.0.0