Use kebab style arg

Related: pypa/gh-action-pypi-publish#125

Author: schloerke

.github/workflows/pytest.yaml

@@ -186,7 +186,7 @@ jobs:
         with:
           user: __token__
           password: ${{ secrets.PYPI_TEST_API_TOKEN }}
-          repository_url: https://test.pypi.org/legacy/
+          repository-url: https://test.pypi.org/legacy/
 
       ## prod deploy ----
       - name: "Deploy to PyPI"