Make Validator::getValue() public (#49007)

Make the getValue() method of the Validator class have public access.

src/Illuminate/Validation/Validator.php

@@ -1108,7 +1108,7 @@ public function setData(array $data)
      * @param  string  $attribute
      * @return mixed
      */
-    protected function getValue($attribute)
+    public function getValue($attribute)
     {
         return Arr::get($this->data, $attribute);
     }