Bump pytest-xdist from 3.6.1 to 3.7.0 in /packaging/tests (#6281)

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.6.1 to 3.7.0.
- [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@v3.6.1...v3.7.0)

---
updated-dependencies:
- dependency-name: pytest-xdist
  dependency-version: 3.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packaging/tests/requirements.txt

@@ -3,7 +3,7 @@ iterators==0.2.0
 psutil==7.0.0
 pytest==8.3.5
 pytest-html==4.1.1
-pytest-xdist==3.6.1
+pytest-xdist==3.7.0
 py>=1.8.2
 requests<2.33.0
 six==1.17.0