Convert workflow from flit to twine for publishing

.github/workflows/python-publish.yml

@@ -21,10 +21,11 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install setuptools wheel flit
+          pip install setuptools wheel twine
       - name: Build and publish
         env:
-          FLIT_USERNAME: ${{ secrets.PYPI_USERNAME }}
-          FLIT_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
         run: |
-          flit publish
+          python -m build
+          twine upload dist/*