Update pytest-xdist requirement from ==3.7.* to ==3.8.* (#5287)

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](https://github.com/pytest-dev/pytest-xdist/compare/v3.7.0...v3.8.0)

---
updated-dependencies:
- dependency-name: pytest-xdist
  dependency-version: 3.8.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -122,7 +122,7 @@ dev = [
   "pytest-django==4.*",
   "pytest-mock==3.14.*",
   "pytest-sugar",
-  "pytest-xdist==3.7.*",
+  "pytest-xdist==3.8.*",
   "pytest==8.4.*",
   "responses",
 ]