install build module

.github/workflows/python-cibuildwheel-pybind.yml

@@ -152,6 +152,7 @@ jobs:
       - name: Build SDist
         run: |
           export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          python -m pip install --upgrade build
           python -m pip install . && \
           python -m build --sdist
           python -m pip install dist/*.tar.gz -v && \