Update publish action

Author: Marius Træet Gilberg

.github/workflows/python-publish.yml

@@ -22,8 +22,8 @@ jobs:
         pip install setuptools wheel twine build
     - name: Build and publish
       env:
-        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
-        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_API_KEY }}
       run: |
         python -m build
         twine upload dist/*