remove unnecessary environment update

Author: matthewbastien

.github/workflows/scripts/windows/setup.ps1

@@ -10,10 +10,3 @@ if ($Process.ExitCode -eq 0) {
     Write-Host  ('FAILED ({0})' -f $Process.ExitCode)
     exit 1
 }
-
-$env:GITHUB_ENV
-Get-Content $env:GITHUB_ENV | foreach {
-    $name, $value = $_.split('=')
-    Write-Host "Setting environment variable '$name' to '$value'"
-    Set-Content env:\$name $value
-}