Use twine from tox venv

Signed-off-by: Nicolas Bock <[email protected]>

Author: nicolasbock

.github/workflows/publish.yaml

@@ -37,4 +37,4 @@ jobs:
         TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
       run: |
         tox -e pypi
-        twine upload .tox/pypi/dist/*
+        .tox/pypi/bin/twine upload .tox/pypi/dist/*