Bump pytest from 8.3.5 to 8.4.0 in /requirements

Bumps [pytest](https://github.com/pytest-dev/pytest) from 8.3.5 to 8.4.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.3.5...8.4.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/requirements_test.txt

@@ -4,7 +4,7 @@ graphviz==0.20.1
 imageio==2.37.0
 imageio-ffmpeg==0.6.0
 pypandoc_binary==1.15
-pytest==8.3.5
+pytest==8.4.0
 pytest-cov==6.1.1
 pytest-order==1.3.0
 pytest-rerunfailures==15.0