new cx_Freeze release should finally allow us to pack new delvewheel'ed scipy and matplotlib, so undo 57f2133 and pin cx_Freeze to that release

Author: dcnieho

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
         python:
           - "3.10.x"
         cx-freeze:
-          - "v6.15.0"
+          - "v6.15.1"
     name: "Build exe for ${{ matrix.os }}"
     runs-on: "${{ matrix.os }}"
     steps:
@@ -32,7 +32,7 @@ jobs:
 
       - name: "Install cx_Freeze bootloader"
         run: |
-          python -m pip install --upgrade --pre --extra-index-url https://marcelotduarte.github.io/packages/ cx_Freeze
+          python -m pip install cx_Freeze==${{ matrix.cx-freeze }}
 
       # === BUILD ===