Change module map name

Author: mhegazy

.github/actions/setup-build/action.yml

@@ -366,7 +366,7 @@ runs:
         $WinSdkModuleMap = Join-Path $WindowsSdkShareFolder "winsdk.modulemap"
         curl -s `
           -H "Authorization: Bearer ${{ github.token }}" `
-          https://raw.githubusercontent.com/swiftlang/swift/main/stdlib/public/Platform/winsdk.modulemap `
+          https://raw.githubusercontent.com/swiftlang/swift/main/stdlib/public/Platform/winsdk_um.modulemap `
           -o $WinSdkModuleMap
         if ($LASTEXITCODE -eq 0) {
           Write-Output "ℹ️ Updated Windows SDK module map."