Remove workaround to provide 8.1 support in PDOStatementStub

Author: craig410

test/unit/Mutex/BasicPDOStatementStub.php

@@ -40,18 +40,6 @@ public function __construct(array $result) { $this->result = $result; }
 
         public function fetchAll(?int $fetch_style = NULL, mixed ...$fetch_argument): array
         {
-            if (PHP_VERSION_ID < 80100) {
-                // Before 8.1, ints and floats were returned as strings
-                // https://www.php.net/manual/en/migration81.incompatible.php#migration81.incompatible.pdo.mysql
-                $this->result = array_map(
-                    fn($row) => array_map(
-                        fn($column) => (is_int($column) || \is_float($column)) ? (string) $column : $column,
-                        $row
-                    ),
-                    $this->result
-                );
-            }
-
             if ($fetch_style === NULL) {
                 return $this->result;
             } elseif ($fetch_style === PDO::FETCH_COLUMN) {