invoke pip via "python -m"

.github/workflows/cd-pypi.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install build
+        python -m pip install build
     - name: Build package
       run: python -m build
     - name: Publish to PyPI