type hints in symfony require update

Author: montypanday

src/Console/Helper/Question/AlwaysReturnKeyOfChoiceQuestion.php

@@ -42,7 +42,7 @@ public function __construct($question, array $choiceViews, $default = null)
     /**
      * @param bool $multiselect
      */
-    public function setMultiselect($multiselect)
+    public function setMultiselect(bool $multiselect): static
     {
         $this->_multiselect = $multiselect;
 
@@ -52,17 +52,17 @@ public function setMultiselect($multiselect)
     /**
      * @param string $errorMessage
      */
-    public function setErrorMessage($errorMessage)
+    public function setErrorMessage(string $errorMessage): static
     {
         $this->_errorMessage = $errorMessage;
 
         return parent::setErrorMessage($errorMessage);
     }
 
     /**
-     * @return callable
+     * @return callable|null
      */
-    public function getValidator()
+    public function getValidator(): ?callable
     {
         return function ($selected) {
             // Collapse all spaces.