Update build action

The new process has been simplified now that we've moved away from using
setup.py and rely on pyproject.toml
This uses the newer build system recommended by PyPA

.github/workflows/python-publish.yml

@@ -23,9 +23,8 @@ jobs:
 
     - name: Setup and Build
       run: |
-        pip install -U pip
-        pip install .[setup]
-        python setup.py sdist bdist_wheel
+        pip install -U pip build
+        python -m build
         python -m twine check dist/*
 
     - name: Build and publish