Bump pytest-xdist from 3.5.0 to 3.6.1 in /.github/workflows/etc

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.5.0 to 3.6.1.
- [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@v3.5.0...v3.6.1)

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

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

Author: dependabot[bot]

.github/workflows/etc/requirements.txt

@@ -18,5 +18,5 @@ h5py==3.11.0
 
 # testing
 pytest==8.2.0
-pytest-xdist==3.5.0
+pytest-xdist==3.6.1
 pytest-xvfb==3.0.0; sys_platform == 'linux'