build(deps): bump pytest-xdist from 3.3.1 to 3.5.0 in /requirements

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.3.1 to 3.5.0.
- [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@v3.3.1...v3.5.0)

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

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

requirements/tests.txt

@@ -2,4 +2,4 @@ numpy; python_version=='3.7'
 numpy==1.26.1; python_version>='3.8'
 pytest==7.4.3
 pytest-cov==4.1.0
-pytest-xdist==3.3.1
+pytest-xdist==3.5.0