Update python-publish.yml

Author: Pytlicek

.github/workflows/python-publish.yml

@@ -35,4 +35,4 @@ jobs:
         TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
       run: |
         python setup.py sdist bdist_wheel
-        twine upload dist/*
+        twine upload -r testpypi dist/*