Update pytest-xdist requirement from ^2.3.0 to ^3.5.0

Updates the requirements on [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) to permit the latest version.
- [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@v2.3.0...v3.5.0)

---
updated-dependencies:
- dependency-name: pytest-xdist
  dependency-type: direct:development
...

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

pyproject.toml

@@ -63,7 +63,7 @@ coverage = "==7.2.7"
 pdoc = "^14"
 more-itertools = "~=8.6.0"
 pre-commit = "==v2.10.1"
-pytest-xdist = "^2.3.0"
+pytest-xdist = "^3.5.0"
 types-PyYAML = "^6.0.9"
 msgpack-types = "^0.2"
 envclasses = "^0.2.1"