updated source package build

Author: flexatone

.github/workflows/ci.yml

@@ -18,8 +18,8 @@ jobs:
       - uses: actions/setup-python@master
         with:
           python-version: 3.14
-      - run: pip install -r requirements-build-3_14.txt
-      - run: python setup.py sdist
+      - run: python -m pip install build
+      - run: python -m build --sdist
       - uses: actions/upload-artifact@v4
         with:
           name: dist-sdist