build(deps): Bump django in /testing/plugins_integration (#12890)

Bumps [django](https://github.com/django/django) from 5.1.1 to 5.1.2.
- [Commits](django/django@5.1.1...5.1.2)

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

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -1,5 +1,5 @@
 anyio[curio,trio]==4.6.2
-django==5.1.1
+django==5.1.2
 pytest-asyncio==0.24.0
 pytest-bdd==7.3.0
 pytest-cov==5.0.0