chore(deps): update pytest-xdist requirement from ==3.3.* to ==3.5.*

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@v3.3.0...v3.5.0)

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

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

requirements-testing.txt

@@ -2,7 +2,7 @@ coverage[toml] == 7.*
 pytest == 7.4.*
 pytest-cov == 4.1.*
 pytest-timeout == 2.2.*
-pytest-xdist == 3.3.*
+pytest-xdist == 3.5.*
 black == 23.*
 ruff == 0.1.*
 mypy == 1.6.*