build(deps): bump pytest-twisted in /testing/plugins_integration

Bumps [pytest-twisted](https://github.com/pytest-dev/pytest-twisted) from 1.13.3 to 1.13.4.
- [Release notes](https://github.com/pytest-dev/pytest-twisted/releases)
- [Commits](pytest-dev/pytest-twisted@v1.13.3...v1.13.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

testing/plugins_integration/requirements.txt

@@ -10,6 +10,6 @@ pytest-mock==3.6.1
 pytest-rerunfailures==10.1
 pytest-sugar==0.9.4
 pytest-trio==0.7.0
-pytest-twisted==1.13.3
+pytest-twisted==1.13.4
 twisted==21.7.0
 pytest-xvfb==2.0.0