build(deps-dev): update pytest-xdist requirement (#677)

Updates the requirements on [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-xdist@v2.0.0...v3.3.1)

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

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

pyproject.toml

@@ -54,7 +54,7 @@ docs = [
 test = [
   "coverage[toml]>=6,<8",
   "pytest>=7,<8",
-  "pytest-xdist>=2,<3",
+  "pytest-xdist>=2,<4",
   "pytest-mock>=3,<4",
   "pytest-lazy-fixture~=0.6.3",
   "pytest-cov>=4,<5",