build(deps): Bump django in /testing/plugins_integration (#12951)

Bumps [django](https://github.com/django/django) from 5.1.2 to 5.1.3.
- [Commits](django/django@5.1.2...5.1.3)

---
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>

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -1,5 +1,5 @@
 anyio[curio,trio]==4.6.2.post1
-django==5.1.2
+django==5.1.3
 pytest-asyncio==0.24.0
 pytest-bdd==7.3.0
 pytest-cov==6.0.0