💚 Downgrade actions/checkout on windows build servers

actions/checkout#852. MS can't even support their own OS properly.

Author: trickypr

.github/workflows/alpha.yml

@@ -278,7 +278,7 @@ jobs:
     needs: [build-data]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
         with:
           submodules: recursive