Run Windows update specifically in the Windows powershell

src/steps/powershell.rs

@@ -32,6 +32,14 @@ impl Powershell {
         Powershell { path, profile }
     }
 
+    #[cfg(windows)]
+    pub fn windows_powershell() -> Self {
+        Powershell {
+            path: which("powershell").filter(|_| !is_dumb()),
+            profile: None,
+        }
+    }
+
     #[cfg(windows)]
     pub fn has_module(powershell: &PathBuf, command: &str) -> bool {
         Command::new(&powershell)