build(deps): Bump anyio[trio] in /testing/plugins_integration (#14034)

Bumps [anyio[trio]](https://github.com/agronholm/anyio) from 4.11.0 to 4.12.0.
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Commits](agronholm/anyio@4.11.0...4.12.0)

---
updated-dependencies:
- dependency-name: anyio[trio]
  dependency-version: 4.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -1,4 +1,4 @@
-anyio[trio]==4.11.0
+anyio[trio]==4.12.0
 django==5.2.9
 pytest-asyncio==1.3.0
 pytest-bdd==8.1.0