Also update to build backend in publish workflow

Author: krassowski

.github/workflows/publish.yml

@@ -15,10 +15,10 @@ jobs:
         python-version: 3.8
     - name: Install build dependencies
       run: |
-        python -m pip install --upgrade pip wheel
+        python -m pip install --upgrade pip wheel build
     - name: Build package
       run: |
-        python setup.py sdist bdist_wheel
+        python -m build
     - name: Publish a Python distribution to PyPI
       uses: pypa/[email protected]
       with: