pyproject: move pytest config from tox.ini

pyproject.toml

@@ -66,6 +66,12 @@ include-package-data = false
 [tool.setuptools_scm]
 write_to = "src/xdist/_version.py"
 
+[tool.pytest.ini_options]
+# pytest-services also defines a worker_id fixture, disable
+# it so they don't conflict with each other (#611).
+addopts = "-ra -p no:pytest-services"
+testpaths = ["testing"]
+
 [tool.ruff]
 src = ["src"]
 

tox.ini

@@ -48,9 +48,3 @@ deps =
     sphinx_rtd_theme
 commands =
     sphinx-build -W --keep-going -b html docs docs/_build/html {posargs:}
-
-[pytest]
-# pytest-services also defines a worker_id fixture, disable
-# it so they don't conflict with each other (#611).
-addopts = -ra -p no:pytest-services
-testpaths = testing