Add setuptools to pip test to make it more robust

This avoids distutils import errors.

.github/workflows/pip-test.yml

@@ -20,5 +20,6 @@ jobs:
       - name: Install pypi package
         run: |
           python -m pip install --upgrade pip
+          pip install setuptools
           pip install $PACKAGE_NAME
           python -m $PACKAGE_NAME -h