ext/standard: Change return value of array_multisort() to true (php#16520)

It stopped being able to return false since PHP 8.0 when all warnings and false returns were converted to ValueErrors and TypeErrors

Author: Girgias

ext/standard/basic_functions.stub.php

@@ -1858,7 +1858,7 @@ function array_udiff_uassoc(array $array, ...$rest): array {}
  * @prefer-ref $array
  * @prefer-ref $rest
  */
-function array_multisort(&$array, &...$rest): bool {}
+function array_multisort(&$array, &...$rest): true {}
 
 /** @return int|string|array<int, int|string> */
 function array_rand(array $array, int $num = 1): int|string|array {}