fix the way packages are built in the public workflow

Author: dhellmann

.github/workflows/python-publish.yaml

@@ -24,10 +24,10 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install setuptools wheel twine pbr
+        pip install .[build]
     - name: Build sdist and wheel
       run: |
-        python setup.py sdist bdist_wheel
+        python -m build
     - name: Publish distribution to PyPI
       # This condition prevents PRs from being published as part of
       # the test job.