build(NoTicket): bump pytest-xdist from 2.5.0 to 3.8.0

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 2.5.0 to 3.8.0.
- [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@v2.5.0...v3.8.0)

---
updated-dependencies:
- dependency-name: pytest-xdist
  dependency-version: 3.8.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

setup.cfg

@@ -63,7 +63,7 @@ dev =
     pytest-mock==3.15.1
     pytest-timeout==2.1.0
     pytest-trio==0.8.0
-    pytest-xdist==2.5.0
+    pytest-xdist==3.8.0
     trio-typing[mypy]>=0.6,<0.11
     types-cryptography==3.3.18
 docs =