Configure pip to prefer binary wheels in mypy workflow.

Author: domdfcoding

.github/workflows/mypy.yml

@@ -53,13 +53,14 @@ jobs:
           sudo apt update
           sudo apt install libhdf5-dev netcdf-bin libnetcdf-dev
 
-      - name: Install dependencies (Win/mac) 🔧
+      - name: Install dependencies (Windows) 🔧
         if: ${{ matrix.os != 'ubuntu-20.04' && steps.changes.outputs.code == 'true' }}
         run: |
           python -VV
           python -m site
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install --upgrade tox virtualenv
+          pip config set global.prefer-binary true
 
       - name: "Run mypy"
         if: steps.changes.outputs.code == 'true'