Copy 2nd amd64 SDK instead of refetching

Author: kendal

.github/workflows/swift-toolchain.yml

@@ -2158,11 +2158,8 @@ jobs:
           name: windows-sdk-amd64
           path: ${{ github.workspace }}/BinaryCache/
 
-      - name: Download Windows SDK (AMD64)
-        uses: actions/download-artifact@v4
-        with:
-          name: windows-sdk-amd64
-          path: ${{ github.workspace }}/BuildRoot/
+      - name: Copy Windows SDK (AMD64) to BuildRoot
+        run: Copy-Item -Recurse -Force -Path ${{ github.workspace }}/BinaryCache/* -Destination ${{ github.workspace }}/BuildRoot/
 
       - name: Update environment variables
         run: |