[ci] fix failed deploy job

use pypa/build to build source distribution so it fetchs build deps from pyproject.toml.
Last time it failed because it was missing pkgconfig.
Use pipx run to bootstrap both build and twine tools

.github/workflows/ci.yml

@@ -50,10 +50,6 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: "3.x"
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install --upgrade setuptools cython wheel twine
     - name: Download artifacts from build jobs
       uses: actions/download-artifact@v4
       with:
@@ -108,5 +104,5 @@ jobs:
         else
           echo "DEBUG: This is a final release"
         fi
-        python setup.py sdist
-        twine upload dist/*
+        pipx run build --sdist --outdir dist/
+        pipx run twine upload dist/*