Use getter method to retrieve except array (#41634)

Imagine somebody wants to dynamically set $except array in the middleware. Then they should do it in __construct(). But this way, they can easily override getExcludedPaths() to add their own functionality.

Author: mahdyfo

src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php

@@ -111,7 +111,7 @@ protected function hasValidBypassCookie($request, array $data)
      */
     protected function inExceptArray($request)
     {
-        foreach ($this->except as $except) {
+        foreach ($this->getExcludedPaths() as $except) {
             if ($except !== '/') {
                 $except = trim($except, '/');
             }