Upgrade to latest Symfony HttpFoundation tag. Closes #1865.

laravel/vendor/Symfony/Component/HttpFoundation/File/UploadedFile.php

@@ -118,6 +118,19 @@ class UploadedFile extends File
         return $this->originalName;
     }
 
+    /**
+     * Returns the original file extension
+     *
+     * It is extracted from the original file name that was uploaded.
+     * Then is should not be considered as a safe value.
+     *
+     * @return string The extension
+     */
+    public function getClientOriginalExtension()
+    {
+        return pathinfo($this->originalName, PATHINFO_EXTENSION);
+    }
+
     /**
      * Returns the file mime type.
      *