Update Windows.yml

Author: NikolajBjorner

.github/workflows/Windows.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Create build directory
         run: md build
       - name: Build