Merge pull request #572 from tskit-dev/dependabot/pip/requirements/CI-tests-pip/pytest-xdist-2.3.0

Bump pytest-xdist from 2.2.1 to 2.3.0 in /requirements/CI-tests-pip

Author: mergify[bot]

requirements/CI-tests-pip/requirements.txt

@@ -6,7 +6,7 @@ matplotlib==3.4.2
 numpy==1.20.3
 pandas==1.2.4
 pytest==6.2.4
-pytest-xdist==2.2.1
+pytest-xdist==2.3.0
 seaborn==0.11.1
 sortedcontainers==2.4.0
 tqdm==4.61.2