build(deps): bump pytest-xdist from 3.7.0 to 3.8.0 in /requirements (#1245)

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
...

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -4,6 +4,6 @@ matplotlib == 3.10.1
 cvxpy == 1.6.6
 ecos == 2.0.14
 pytest == 8.4.1 # For unit test
-pytest-xdist == 3.7.0 # For unit test
+pytest-xdist == 3.8.0 # For unit test
 mypy == 1.16.1 # For unit test
 ruff == 0.12.1 # For unit test