Normalize MSVC PATH export

.github/actions/setup-msvc-env/action.yml

@@ -78,6 +78,9 @@ runs:
           $name = $matches[1]
           $value = $matches[2]
           if ($varsToExport -contains $name) {
+            if ($name -ieq "Path") {
+              $name = "PATH"
+            }
             "$name=$value" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
           }
         }