fix(install.ps1): change cpu check (#9921)

src/cli/install.ps1

@@ -16,7 +16,7 @@ param(
 );
 
 # filter out 32 bit + ARM
-if ($env:PROCESSOR_ARCHITECTURE -ne "AMD64") {
+if (-not ((Get-CimInstance Win32_ComputerSystem)).SystemType -match "x64-based") {
   Write-Output "Install Failed:"
   Write-Output "Bun for Windows is currently only available for x86 64-bit Windows.`n"
   return 1