Fix Monolog v3 compatibility for Magento 2.4.8

[rk-2083]

Problem

Running bin/magento setup:upgrade on Magento 2.4.8 throws a fatal PHP error:

PHP Fatal error: Declaration of Vipps\Payment\Model\Logger\Handler\Debug::isHandling(array $record): bool
must be compatible with Monolog\Handler\AbstractHandler::isHandling(Monolog\LogRecord $record): bool
in .../Model/Logger/Handler/Debug.php on line 67

Monolog v3 (shipped with Magento 2.4.8) changed the isHandling() signature
from array $record to Monolog\LogRecord $record, making the module completely
unusable — even bin/magento module:disable fails.

Fix

Updated isHandling() parameter type in Model/Logger/Handler/Debug.php
to accept \Monolog\LogRecord|array $record, compatible with both Monolog v2 and v3.

Tested on

Magento 2.4.8-p4 with Monolog v3