Try GHA build fixes

Author: animetosho

.github/workflows/build-dev-win64.yml

@@ -21,7 +21,7 @@ jobs:
         working-directory: nexe
       # diagnose weird execution failure
       - run: |
-          "C:\Program Files\Git\usr\bin\sed" "-i" "s/child_process_1\.spawn/this.log.step('Executing ' + command + ' ' + args); \0/" node_modules/nexe/lib/compiler.js
+          Start-Process -FilePath "C:\Program Files\Git\usr\bin\sed" -ArgumentList "-i", "s/child_process_1\.spawn/this.log.step('Executing ' + command + ' ' + args); \0/", "node_modules/nexe/lib/compiler.js"
         working-directory: nexe
       - run: node build
         working-directory: nexe