updated pypi publisher

Author: MWieland

.github/workflows/python-publish.yml

@@ -13,4 +13,6 @@ jobs:
       id-token: write
     steps:
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          python-version: '3.x'