MC-23123: PHP 7.1 syntax in 2.2 release line

Author: nathanjosiah

dev/tests/integration/_files/Magento/TestModuleSimpleTemplateDirective/Model/MyDirProcessor.php

@@ -30,15 +30,15 @@ public function getName(): string
     public function process(
         $value,
         array $parameters,
-        ?string $html
+        $html = null
     ): string {
         return $value . $parameters['param1'] . $html;
     }
 
     /**
      * @inheritDoc
      */
-    public function getDefaultFilters(): ?array
+    public function getDefaultFilters()
     {
         return ['foofilter'];
     }

lib/internal/Magento/Framework/Filter/SimpleDirective/ProcessorInterface.php

@@ -33,13 +33,13 @@ public function getName(): string;
     public function process(
         $value,
         array $parameters,
-        ?string $html
+        $html = null
     ): string;
 
     /**
      * Default filters to apply if none provided in a template.
      *
      * @return string[]|null
      */
-    public function getDefaultFilters(): ?array;
+    public function getDefaultFilters();
 }