Update ruleset

Author: swissspidy

phpcs.xml.dist

@@ -63,7 +63,7 @@
 		 Related: https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/issues/1623 -->
 	<rule ref="WordPress.NamingConventions.ValidVariableName">
 		<properties>
-			<property name="customPropertiesWhitelist" type="array">
+			<property name="allowed_custom_properties" type="array">
 				<element value="Language"/>
 				<element value="Name"/>
 				<element value="Type"/>