Fix phpstan.

phpstan.neon

@@ -29,6 +29,7 @@ parameters:
         - '#Result of method Cake\\Auth\\BaseAuthenticate::unauthenticated\(\) \(void\) is used#'
         - '#Call to an undefined method DateTimeInterface::setTimezone\(\)#'
         - '#Access to undefined constant NumberFormatter::CURRENCY_ACCOUNTING#'
+        - '#Class APCuIterator referenced with incorrect case: APCUIterator#'
     earlyTerminatingMethodCalls:
         Cake\Console\Shell:
             - abort