Clear a cached user in RequestGuard if a request is changed (#35692)

* Clear a cached user in RequestGuard if a request is changed

This guard retrieves a user from a request data, so a cached user should be cleared on a request change.

* fix indentation

Author: n7olkachev

src/Illuminate/Auth/RequestGuard.php

@@ -82,6 +82,8 @@ public function setRequest(Request $request)
     {
         $this->request = $request;
 
+        $this->user = null;
+
         return $this;
     }
 }