Fix getting affected rows from $statement not $pdo (#5166)

Author: kingIZZZY

src/PostgreSqlSwooleExtConnection.php

@@ -83,7 +83,7 @@ public function affectingStatement(string $query, array $bindings = []): int
             $result = $statement->execute($this->prepareBindings($bindings));
 
             $this->recordsHaveBeenModified(
-                ($count = $this->pdo->affectedRows($result)) > 0
+                ($count = $statement->affectedRows($result)) > 0
             );
 
             return $count;