Outer Build: Pipx CMake Latest, too

Author: ax3l

.github/workflows/build.yml

@@ -174,8 +174,8 @@ jobs:
         CIBW_TEST_COMMAND: pytest {project}/tests/python/test_push.py
       run: |
         cd src
-        python -m pip install --upgrade pip build setuptools[core] wheel
-        python -m pip install --upgrade cmake
+        python -m pip install --upgrade pip pipx build setuptools[core] wheel
+        python -m pipx --global install cmake
         python -m cibuildwheel --output-dir ../wheelhouse
 
       # note - intentionally skipping a source package