Update GitHub Actions workflow for PyPI publishing

- Change TWINE_USERNAME to use the token method for authentication
- Update TWINE_PASSWORD to utilize the new PYPI_API_TOKEN secret for enhanced security

Author: claffin

.github/workflows/publish-pypi.yml

@@ -35,8 +35,8 @@ jobs:
         pip install build twine
     - name: Build and publish
       env:
-        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
-        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
       run: |
         python -m build
         twine check dist/*