Do not use pip to install cmake

Fixes #122.

Author: certik

.github/workflows/CI.yml

@@ -35,9 +35,6 @@ jobs:
       with:
         python-version: 3.x
 
-    - name: Set up common
-      run: pip install --upgrade cmake
-
     - name: Install GFortran Linux
       if: contains( matrix.os, 'ubuntu')
       run: |