CI: attempt to fix windows not finding cross-env

Author: todbot

.github/workflows/windows.yml

@@ -45,6 +45,7 @@ jobs:
       - name: Build
         run: |
           $env:CSC_LINK="${{ steps.write_file.outputs.filePath }}"
+          npm install --save-dev cross-env
           npm install
           npm run pack
           npm run dist:draft