Bump pytest-xdist from 3.7.0 to 3.8.0 in /requirements (#1189)

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.7.0 to 3.8.0.
- [Release notes](https://github.com/pytest-dev/pytest-xdist/releases)
- [Changelog](https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-xdist@v3.7.0...v3.8.0)

---
updated-dependencies:
- dependency-name: pytest-xdist
  dependency-version: 3.8.0
  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]

requirements/test.txt

@@ -1,7 +1,7 @@
 gitpython==3.1.44
 packaging==25.0
 pytest==8.4.1
-pytest-xdist==3.7.0
+pytest-xdist==3.8.0
 pytest-cov==6.2.1
 ruff==0.12.2
 setuptools==80.9.0