feat(TypeHints): Add SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue sniffer for PHP 8.4 (#3471146)

Author: andypost

coder_sniffer/Drupal/ruleset.xml

@@ -135,6 +135,7 @@
    <property name="spacesCountAroundEqualsSign" value="0"/>
   </properties>
  </rule>
+ <rule ref="SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue" />
 
  <rule ref="Squiz.Arrays.ArrayDeclaration" />
  <!-- Disable some error messages that we do not want. -->