Bump pytest-xdist from 3.2.0 to 3.3.1 in /requirements/CI

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.2.0 to 3.3.1.
- [Changelog](https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-xdist@v3.2.0...v3.3.1)

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

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

requirements/CI/requirements.txt

@@ -3,7 +3,7 @@ coverage==6.3.3
 flake8==5.0.4
 pytest==7.2.1
 pytest-cov==4.0.0
-pytest-xdist==3.2.0
+pytest-xdist==3.3.1
 setuptools-scm==7.1.0
 sphinx==4.3.2
 sphinx-argparse==0.4.0