Switch to official PyPA build frontend for sdist

ref https://pypi.org/project/build/

Author: ddelange

.github/workflows/release.yml

@@ -63,8 +63,8 @@ jobs:
 
     - name: Build source distribution
       run: |
-        pip install -U setuptools wheel pip
-        python setup.py sdist
+        pip install -U setuptools wheel build
+        python -m build --sdist
 
     - uses: actions/upload-artifact@v4
       with: