Append @deprecated directive fot Input's fields

Author: TaProhm

Diff for: src/Config/InputObjectTypeDefinition.php

@@ -32,6 +32,7 @@ public function getDefinition(): ArrayNodeDefinition
                         ->append($this->descriptionSection())
                         ->append($this->defaultValueSection())
                         ->append($this->validationSection(self::VALIDATION_LEVEL_PROPERTY))
+                        ->append($this->deprecationReasonSection())
                     ->end()
                     ->isRequired()
                     ->requiresAtLeastOneElement()