try ensuring deps in tox.ini instead

Author: sgbaird

.github/workflows/ci.yml

@@ -73,8 +73,6 @@ jobs:
         id: setup-python
         with:
           python-version: ${{ matrix.python }}
-      - name: Install dependencies
-        run: pipx install pytest-xdist
       - name: Retrieve pre-built distribution files
         uses: actions/download-artifact@v3
         with: {name: python-distribution-files, path: dist/}

tox.ini

@@ -17,6 +17,9 @@ passenv =
     SETUPTOOLS_*
 extras =
     testing
+deps =
+    pytest
+    pytest-xdist
 commands =
     pytest {posargs}